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A lot of attention is paid towards various components when tuning performance in an AEG, but it seems piston head O-rings are often overlooked beyond merely testing that they seal against the cylinder. A typical piston head O-ring measures about 24mm outer diameter, like these ones: https://www.ak2m4.co.uk/internal-parts/pistons-heads/piston-head-o-ring-19.5mm https://www.ak2m4.co.uk/internal-parts/pistons-heads/piston-head-o-ring-viton-19mm However for some time now I've been wondering if it's actually better to use slightly smaller O-rings, somewhere around 23.7-23.8mm, or perhaps even a bit smaller than that (as close as possible to or just a tiny bit smaller than the diameter of the cylinder; if it's a tiny bit smaller the pressure ahead of the piston & air flow through the ports in the piston head should expand it to seal completely once it's moving at speed). The idea being to reduce losses due to friction and allow the piston to gain slightly more energy before compression begins. This is because a few years ago after performing maintenance on my TM P90RD and replacing the piston head O-ring that I thought was worn out with a new "good" one, I noticed it had lost a significant amount of power. Putting the "bad" O-ring back in put the power back up to where it was supposed to be... I subsequently discovered that while the "bad" O-ring didn't seal when tested the usual way (which is what made me initially conclude that it was bad), it would actually seal just fine when the piston was moving fast enough. I've since noticed this effect with my other guns too, although none of those have managed to reach the performance of my P90RD (which just about manages 340fps on an SP90 spring while the others do a little over 330). I recently decided to test this, so I bought some O-rings that are supposed to be 23.74mm outer diameter and have now tested them alongside some other piston head O-rings. The test gun is a TM P90TR with: ZCI 6.02mm barrel (247mm) Prometheus purple hop rubber & bucking (hop is not properly set but remained unchanged throughout the tests) Guarder air seal nozzle Guarder enhanced stainless steel cylinder head Guarder enhanced cylinder, 3/4 type Deep Fire aluminium piston head Tokyo Marui stock piston Guarder SP90 spring Deep Fire (I think) bearing spring guide Guarder steel bushings IRF2804 MOSFET Blade fuse Deans connector Each O-ring tested was given a very light surface coating of silicone oil before being coated in TechT Gun Sav and installed on to the piston head. Before testing the gearbox was cycled a few times without the upper receiver/barrel assembly to clear any excess grease out of the nozzle & prevent any finding its way into the barrel and risk affecting the results. BioSphere 0.2g BBs were used for testing, 10 shots were fired for each test and the average value used. These are the results (O-ring size measurements are approximate as they're never perfectly round): Lees Precision Engineering piston head O-ring 24mm (19mm inner diameter/2.5mm cross-section): 322 fps (min 319.6, max 323.5) This is a standard size good quality O-ring that comes with LPE piston heads, with the result being about what I expected. Deep Fire 'super' O-ring (measured ~23.8mm OD, 2.6mm cross-section): 332.6 fps (min 330.9, max 334.2) This is what came with the Deep Fire aluminium piston head that's currently in the P90TR. It is a brown colour and feels softer than most other O-rings in addition to being slightly smaller, and there is much less resistance when moving the piston through the cylinder. With this O-ring the gun has an extra ~10fps over the LPE O-ring. Uxcell "23.74mm (18.5mm/2.62mm)" O-ring #1 (actually ~23.9mm-ish): 322.9 fps (min 320.4, max 324.7) This is one of the O-rings I got recently specifically for these tests. I was very surprised by this result, so I checked its size and found that it was larger than specified - around 23.9mm OD. I then measured the rest of the O-rings in the pack and found that all of them measured closer to 23.9mm. I tried again with the smallest one I could find. Uxcell "23.74mm (18.5mm/2.62mm)" O-ring #2 (actually ~23.85mm-ish): 325.6 fps (min 323.1, max 328.3) This time there was a more notable improvement over the standard O-ring, but still not close to the performance of the Deep Fire O-ring. I next went through the O-rings in my spares box to find ones measuring towards the smaller end, and did manage to find a couple that were closer to the size I was looking for: Unknown origin O-ring #1 ~23.8mm (2.4mm CS): 333.3 fps (min 330.3, max 334.7) Unknown origin O-ring #2 ~23.8mm (2.4mm CS): 333.1 fps (min 331.5, max 334.7) These both are about the same size as the Deep Fire O-ring that performed very well, and their performance was about the same too... I was unsure how much of an effect O-ring size would have with a full cylinder & long barrel, so I then fitted a longer barrel to the P90TR to see if that makes any difference in the results, still using the Guarder enhanced 3/4 cylinder to begin with. The barrel is a 509mm unknown brand Chinese non-tightbore barrel (IIRC it originally came from my ~15 year old A&K M249). Ideally I would have used a ZCI tightbore to better compare against the ZCI barrel used in the earlier tests but I don't have one of those so I had to make do with this. LPE standard O-ring + 509mm barrel: 309.5 fps Deep Fire 'super' O-ring + 509mm barrel: 320.1 fps As with the earlier tests the standard O-ring is around 10fps lower than the smaller O-ring. The barrel being a cheap non-tightbore barrel probably accounts for most of the power loss seen here compared with the shorter barrel tests. Finally I put in a Guarder enhanced full cylinder to see how the O-rings compare in a long barrel + full cylinder setup: LPE standard O-ring + 509mm barrel + full cylinder: 321.7 fps Deep Fire 'super' O-ring + 509mm barrel + full cylinder: 318.1 fps Unknown origin O-ring #1 + 509mm barrel + full cylinder: 320.6 fps Interestingly, this time the Deep Fire O-ring actually performed slightly worse than the LPE O-ring. I was expecting that with the full cylinder all O-rings would perform about the same, maybe with the smaller O-rings having a slight advantage. I tried one of the unknown O-rings that was the best performer in the initial tests and while that was better it still had slightly lower performance with this configuration than the LPE O-ring. I'm not sure why this is, as they all form a seal right from the start... it may be that the smaller O-rings have more room to inflate against the cylinder and that with the lack of any significant acceleration phase prior to compression starting this costs some energy that otherwise would be used to propel the BB. Conclusions In builds using full cylinders the normal 24mm AEG piston O-rings would seem to be slightly better, although the difference doesn't seem to be that big. However in builds using ported cylinders it looks like it's better to use smaller O-rings, as was the case in both sets of results using the 3/4 cylinder. It can be difficult to find such O-rings though since most AEG piston O-rings are about 24mm and generic O-rings are typically only supplied in a standard set of sizes that are either slightly too big or slightly too small, and even if you can find some that are supposed to be ~23.7-23.8mm they're not likely to be made with such a high degree of precision, as I found out with the ones I bought. Anyway this might be something to keep in mind if you want to gain/lose a little power, or if you're just looking to maximise efficiency - it may not be a huge boost, but a potential 10+fps isn't insignificant and if done in conjunction with other small things that can be done to help boost fps this might be enough to allow the use of a weaker spring to achieve a given power level, which in turn will reduce stress on the rest of the system/improve reliability as well as slightly improve ROF and trigger response etc.

No because some of the most fucked up guns I have ever had to sort were put that way by so called reputable shops/techs. There are very few people out there who actually do good work as most techs just change parts without ever really understanding just because part a and part b are good that they don't actually work well together. Most guns that are built require a certain amount of matching parts and then fine tuning of those parts to get the results and reliability to be what I would call an upgrade. There is a reason that all my personal aegs have the gearbox shells made not bought off a shelf to match the build.

Hello from Brighton & Hove. I recently moved back to the UK. I have a little experience playing airsoft and I thought it would be good to get back into it to make some friends and have a bit of a run around. I was looking at playing at Worthing or Dogtag. So hello if you skirmish there and nice to meet you.

Why not? If your going to have 400 players you NEED a decent marshal to player ratio. The more the better, you cant cut corners on safety to cut costs, well clearly you can but its not acceptable. 6 would be needed in the safe zone to keep order and things working whilst people are playing, 6 wouldnt cover the parking if there were 200 odd cars.

final design. this is pair number 5. the mount works on Edgewear ‎SSE611-TT and ESS ICE frames.

🤣

Probably best to just to delete this thread and get on with our lives, eh.

I think the big-brain genius is talking about trying to smuggle a RIF back hidden in his car, without a defence, and just hoping that he won't get caught. I'm torn between wanting him to try it, and hoping that he doesn't.

What part of it isn't true? I have been through it myself. (Though I had a UKARA)

i thought that's how folk would read it the big problem with such things is the only person who knows how well (or not) a given "upgraded" gun actually shoots is the seller. but even if we assume complete honesty, there's the issue of benchmarking. if the seller claims for example "shoots like a laser" how to they know that the gun they think is good, is actually good? if they're name-dropping a tech that you trust then you can go on that basis, but usually the best you can hope for is to tot up the value of any big-ticket parts in the build.

https://www.usedairsoft.co.uk/rif-s/gas-powered_1/tokyo-marui-hi-capa_i31038

So if an ad had "upgraded by (insert reputable shop/tech) with (insert parts list)", this would be given serious consideration, if of course it was the item you were looking for (as long as the sellar wasnt trying to recoup the cost of work done)? I guess to answer that myself, yes if it was The Item, it would get consideration. But then, there is the whole new boxed smell (read: warranty) thing.

(re)read the forum rules, this is bordering (pun intended) on breaking them: • Illegal/Banned Subjects You cannot discuss anything that will help someone break the law in his or her locale. This means talking about: How to evade paying tax on imported goods How to get restricted items past customs How to get restricted items if you are under-age Any other illegal activities

Thanks mate! I was thinking £90 posted. It's hardly been used but boxless. Sent RM singed for that makes it about £75 for the rif I think. Edit: forgot one's manners.

Lucky, I spent my Airsoft day riding my BMX at the local skatepark, because the forecast said it was gonna pour and all my teammates chickened out, instead we got a surprisingly warm sunny day -.-

Welcome to KWA Kriss Vector Owners Club This page is dedicated to all the KWA Kriss Vector enthusiasts in the UK and around the Globe. On this page, we may share pictures, links and discuss all relevant information from the original KWA KV GBB to upgraded HPA magazine setups. If you own a KWA Kriss Vector or customise them, whatever the case may be, we would like to know your experience and feedback. If you own an AEG Kriss Vector you are welcome to share your pictures and feedback too. We would like to hear from you all. Please be advised, this page is NOT for advertising guns/parts/gears for sale.

Hi folks, have an extremely dumb question to ask here so forgive my rookieness. As part of my sci-fi-ish loadout I purchased a set of Flyye shoulder protectors to a) protect my shoulders as I like to hit the dirt during gameplay and crawl and b) for added sci-fi tacticool vanity. I can't seem to find a way to attach them to my crossdraw vest, will they only work with plate carriers? I tried looping the top velcro strap around the shoulders (I assume that's how they go on) but they end up dragging the vest off my shoulders. I've considered replacing my vest with a plate carrier as I don't run with much gear so don't really need the multiple pouches anymore. Ta, Eezer G

I’m holding out for theTM recoil M14 if and when ever .🥰

I did watch out for that while testing, but there was no notable difference in consistency between them. I don't think you're likely to lose any power/suffer consistency issues to such air loss unless the cylinder is undervolumed for the spring strength & barrel in use. Edit to add: All of the O-rings I tested here do seal fully against the cylinder without relying on pressure ahead of the piston to form a seal, so there shouldn't have been any losses that way... the only piston head O-ring that's loose-fitting enough to not seal outright is in my P90RD & I'm not going to take that apart and mess about with it/invite problems while it's running well

you can get flexi-resins now and I use them when printing parts that need to take a bit of abuse. I usually add it (20% ish) to the normal resin to get a semi flexible print.

Helicoil it

See also YouChoob "celebrities" and "professionals". This used to happen all the time in reenactment as well. Local single-group events were great fun, and carefully run. Big multi-group events tended to become shitshows, with an escalating level of "Well, if you're playing by your own rules, then so am I." Not always, some of them were very well thought through and run, and you could generally tell beforehand which ones they were going to be, and which were going to be wing-it-and-hope whangfests. I know which one this event looked like up front.

Look mummy, I'm going to be a YouTuber.......or just send videos to my mates of me shooting them!

We're talking about AI here, if they can't be arsed to spellcheck their magazine, what chance have you got that they'll properly organise a big event, they've always traded on their "name", in the hope that people will put their trust (& money) in them as a longstanding publication. I've personally played alongside & against the AI editorial team in the past, only to find that they seem to think the game rules dont apply to them, so when I hear criticism of how they run events, I'm not surprised in the least.

Ho-Ho-Ho now I have a machine gun! well actually I've had the gun for a while but only one magazine. If anyone is looking for mags (not the 72 bb version as these are like rocking horse pooh at the moment) then try sendico. Sendico is a Japanese site that buys stuff for you that you normally can't buy from Japan. You need to sign up and add funds to the wallet to make purchases. The way it works is you find an item on their site, which browses all the Japanese retailers, and click buy. They charge you 500 yen per purchase (about £3.30) and then buy the stuff for you and give you a quote for shipping. Shipping just took me 10 days with EMS from Japan. If you shop around you can find the 200 hicaps for as cheap as £21. it's also worth mentioning that if you buy 1 magazine from 1 place they will charge you £3.30 but if you buy 4 mags from the one place they will still only charge you £3.30 Also watch out as the old MP5 mags are usually listed as standard and the new recoil mags are listed as next-generation. here's an example: https://www.sendico.com/rakuten/item/konan:11354709 I've got another 3 hicaps on the way and expect them to be delivered this week some time.

I find it insane that any insurer is crazy enough to offer cover to airsoft events that don't use a mandatory chronograph. Broken eyepro levels of hot gun is just crazy. Tell me more about these fights and fires, sounds thrilling.

Ahoy and welcome. Are you planning to rent for a bit before re-mortgaging the house to buy RIFs?

Showing his missus the advert, before he bumped the price and added: "Don't really want to part ways so might not say yes to offers" ? But then why even leave it up? Either way, avoid like the plague.

Managed cancel the Maritime cover and picked up a helmet bridge which should do the job.

3rd party as it is run by Airsoft retailers, but Border Force has access to it if the parcel is spotted as part of its random checks. It happened to me once and even with a valid UKARA took a few months to get it checked by them and released. If it gets caught being imported without a UKARA number it will likely be destroyed as it's very difficult and time consuming to prove other defenses (That frankly Border force probably won't recognise) For your own sake, just get a UKARA number as it makes things much simpler for you.

plenty of "working" guns can still have serious issues needing correction, hell even (some would even say often) "fucked" guns can have major unguessed at fuckedupness. How I actually read that sentence...

indeed, i'd not even care because it'd be getting a full re-wire anyway. so the term means different things to different people. ahh yes, the "simple fix", famed for rarely being so simple. that said, plenty of "working" guns can still have serious issues needing correction, hell even (some would even say often) "upgraded" guns can have major issues.

All personal taste I suppose. I love bullpups for example. Some think they are awkward, fugly, cursed contraptions. We've all got our tastes. I always thought the Walther P99 looked pretty futuristic. Has that compact, angular, spacey vibe that would fit right in to a Pelican dropship Pilot's loadout...

I'm modding the repro mawl so the laser works. For some reason even though it has a working and wired up Red Laser, no combination of buttons can get it running. What you need to look at are the blue and yellow wires coming from the laser, swap the yellow with the one on the connector and the blue with the grey wire from the IR. You don't need to rewire the rest up just cover it with tape or heatshrink. Obviously doing this will disable the IR laser, but the red laser and torch work fine. There's also no working 2.5mm or 3.5mm connector on the back of the unit, but there is room for one, so I've bought some female 2.5mm jack connectors and i'm going to wire it up so any button plugged into it will toggle the laser on/off. To turn the laser on, you bridge these two connections here. Should be a simple job of drilling a hole for the connector and wiring it to those points. Here's a video of the laser working before screwing it back together: Edit: Ignore the first part of this post, there was no reason to mod the wires I'm a dummy. However I got the switch done:

3m .22lr rounds were nicked from a lorry earlier this year and that barely got any traction at all. Mainly because it was in The Sun, but my spidey senses think it would've been a much bigger story if it was around the same time after that journalist was shot and killed in NI by a .22

Certainly not something I relish in saying, but not unexpected by any means unfortunately. Be interesting to see any further feedback/pictures/video that come out of this. It's a shame that large events basically can't seem to be done in the UK. I'm sure there's the odd exception to the rule but anything I've ever heard of that's had more than around 100-150 or so has been pretty universally panned to the point I do not feel like even the safety would be to an acceptable standard attending any of them, let alone getting an actually fun game.

i was also at the AI500 on the Tan team. met a few new people down there and got chatting, before we ended up putting up our camping gear next to one another so we could have a few drinks and some banter on friday night. as @Impulse stated, there were quite a few issues that need sorting out for future events, however he neglected to mention the big red flag.... there was no chronoing of weapons before anyone went out to play, and the marshalls said they would be spot checking in game and banning anyone found running a hot gun.... i didnt see anyone getting spot checked, nor did several other players i spoke with. i had assumed chrono would be done after the game brief as everyone headed to their CP or at the CP, so when they called game on i was pretty shocked, and i had to insist the marshals brought a chrono to the tan team command post to chrono my weapons before i would go off to play, but it still took them 10 or 15 mins to get there. after the marshall arrived a few other tan chronoed their guns too. saturday was going well, until the bad weather rolled in... the gale force winds made it almost impossible to hit anyone outside the buildings, and by the end of the day everyone looked (and felt) like drowned rats. the winds also demolished almost everyones tents on the camp grounds as they were set on high ground. a few people (including myself) had set their tents on a patch off ground between several buildings so we survived the worst of the storm. the organisers got the site owner to open up several buildings beside the campsite so people could move inside, an offer which everyone that stayed accepted so we had some shelter overnight and could get some semi-decent rest. this morning started off well, despite having to use damp gear from the day before, but after an hour or so the sun came out and the weather stayed warm for the rest of the day. Tans made a great push and managed to push greens back almost to their command post. unfortunately tempers began flaring on both sides, so a lunch break was called to allow everyone to cool down a bit before we all went back out, and greens made a slightly better push than the morning and came close to our command post. there was also a big issue caused inside a building known as "vipers nest", a 3 floor cell block. the rules stated that all mesh railings/fences etc on site were to be considered hard cover (no shooting through, no grenades through or over etc), and this included the anti-suicide nets strung across the cell block, onto which several camo sheets were placed. unfortunately one green player tried dropping a grenade through the anti-suicide net and setting one of the camo sheets on fire. after seeing this and calling for a cease fire i tried to summon a marshal, shouting that there was a fire, but it took a couple of minutes for the marshals to react, as there werent any inside the building. after the fire was put out and game resumed, the marshals declared no pyro in the building, but the message wasnt relayed evenly as several players still set off pyro in the building. saturdays game was called off early for safety reasons, but not before one of the tans slipped and injured themselves pretty bad (not sure what the injury was as there were several rumors doing the rounds). today also saw a green player dislocate their shoulder. both serious injuries and i hope they both recover quickly. as for the guns i was running; -my main rifle was my tippmann M4, and was running ok, but its still bedding in the new posiedon barrel an madbull red shark hop rubber, so not performing at its best -my main pistol was my EMG John Wick hi-capa. It was shooting hot on CO2, so i ran it on gas, but found that it didnt want to cycle at all on green gas on saturday or this morning, but worked well on red gas. i swapped back to green one the temperature started to rise, but only used it for a couple of shots in the afternoon - i ran my Northeast Sten MkII this morning, but only had a few mags. while i had ammo it was running well, but the game was too fast paced for me to spend ages at CP reloading mags, so i swapped it out for the AAP-01. the Sten was shooting well and i really wish i could have run it for longer. - i ran my AAP-01 with a drum mag, and just like Impulse, it was outranging most AEGs on site and firing laser straight... at least until i took a shot and the slide/bold jammed solid half open.. about to strip it now, and will post the results in the aap owners thread, but i suspect it has broken its hammer there was a lot of pyro thrown around, but i have to say that both sides were equally as guilty. plus in many instances a grenade was the only way to deal with a dug in enemy player (or several)

Just got home from ai500 and had a cracking weekend! Definitely some hiccups and hurdles that will need to be smoothed out going forward. The good: Finally getting to play alongside the staff from Worthing for the first time in about 13 years, since skirmish weekends they are busy marshalling and running the site. Also, we were all staying in the same hotel, so the out of game social was amazing fun too. The site itself. The Citadel has some amazing potential for future ai500s. Out-ranging other AEGs with my 1.1J m21. Put a lot of effort into that build, so it's nice to see it paying off. Haha, AAP-01 go brrrr. No, seriously, I was only allowed to fire it semi-auto, but it was the first time I was using it and it was also out-ranging AEGs. Quality gun, that. Met some fantastic players on green team. Yeah, there were some absolute spanners, but the majority I spoke to seemed to be some really great guys and gals. Good arm workout. Carting that m21 around, then also having to pump up my tiny little HPA bottle not once, but twice! On that, I also worked out how many shots it's good for. The answer is around 500 BBs. More than enough for a normal game day, but when there are 200 targets and some gale force winds to deal with, I shoot a lot more shots The bad: The weather. I've never played in such piss poor weather before. 70+ mph winds and a torrential downpour for most of Saturday. Made it worse that the wind was blowing in our faces, so we couldn't see anything (and one guy in my team reported one of his BBs flew back at him after he fired it 🤣) Teething issues. Some stuff they did just... didn't work. I think they'll iron these out for future events, but as the maiden voyage for this site there were some definite issues with the gameplay. Some sketchy play. I'm looking down a scope, I can see my BBs bouncing off people and them just continuing like nothing is wrong. Too much pyro. I have no idea how many pyros the tans were throwing, but on Saturday I only died 6 times and they were all to grenades. I'd hazard a guess that multiple hundreds of grenades were thrown on Saturday alone People gave up early. At one point on Sunday we were outnumbered 4 - 1. Not allowing bolt action sniper rifles. There were so many looooooooooooooong sight lines that a 2.3J bolt action would've been incredibly useful. 1.48J DMRs isn't enough for those sight lines. Ol' reliable TM mk23 fell out of its holster and something snapped in the trigger unit when it hit the ground, so that's going to be a fun tech job to repair. Airsoft is a social hobby, so while the bad technically outnumbers the good, the good points were far more impactful than the bad.

Finally got to run my new loadout today! Mk18 performed phenomenally, was picking off people that before I wouldn’t even have bothered at and didn’t use nearly half as much ammo as I thought I would!

You could at least have blurred my face.

I don't have a problem with patches in airsoft. As others have said, we're all playing dress up at the end of the day. Airsofters wearing impression kit are not the same as the wankers that buy berets and medals off eBay and pass themselves off as veterans at November ceremonies. Me and my mates all wore our issued MTP when we first started a couple of years ago because why pay for extra kit when we had free stuff? No rank slides though!

Update on the L22. Finally sourced a real HK foregrip. Plus after some help from a member on here, have designed and made some correct Sa80 and susat QR code stickers.

Finally got my MAWL today: My heavily customized ICS Hera I'm calling 'Orion'. I've still got the lower receiver the change and the handguard. Strike Industries pins, and an Acetech Blaster supp/tracer unit.

The only thing I don't like about this release is I'm now worried they'll update the recoil line of ARs and the ones I already own will suddenly feel quite obsolete lol. I am stoked to get my MP5 next week though, I think this is TM's best release in a long time and I like a lot of what they do. My personal preference isn't the SD aesthetic but I'm sure a lot of people out there will want to know what brand SD handguard and suppressor you have on there so they can make their own.

I dub thee: The WWSD - 'What Would Speedbird Do' Blaster. If you know, you know. The aim was a super light weight gun for all-round use. It's an unused ICS Sportline I have knocking about (hence shit camo job). It was a light weight plastic gun anyway, but had a wobbly/bendy front end that I was never happy with. So - 50mm Carbon tube hand guard. 3D printed barrel nut, hand guard end cap and barrel stub. ICS Stubby stock. No Outer barrel - the inner barrel is supported by the hand guard end cap. I replaced the RIS receiver rail with a 3D Printed blanking plate. I also added a flared magwell, 3D printed from a thingiverse file that I modded to better fit. No sights (never use 'em anyway - hi-cap 'spray and pray' for the win). It's my 40th Birthday in a couple weeks. Missus is buying me a nice Sparmax airbrush/compressor set, so the receiver will get some kind of 'interesting' paint job. I know, haters gonna hate. But I like it, and that's all that matters to me...😉

Double Eagle B&T ACP556 PDW. newest model from DE using the Falcon gearbox. I'll probably do a review soon.

Sort-of related, but Patrol Base seem to be getting a bit fruity in their Boneyard descriptions. I'm guessing that they're getting tired of punters whinging "but i fort it wud wurk" over and over.

What it says and the reality, is going to be very very different. That to me looks like just the total boundaries. The drops from the green sides into the moat looks around 2 stories. Sunset October is around 7pm. So that's unlikely to be usable. The chunk to the right is going to be parking and camping. You remove the open grass areas, which well are gonna be just that. Leaves you with about 20 very easy to lock down controlled buildings, that are designed to funnel people. Oh and a single bridge across of the bottom left part of the site is going to be so easy to lock down. For the first 20-30 or so people who get over it. No idea how accessible the higher ground is from the moat. So that might change things but this is going to feel a heck of a lot smaller with 200 people shooting you with hicaps. We went to the Gloucester prison and locked down that site with about 50 per site. I mean we have locked down woodlands sites with not many more. That site with 150 would be pretty epic but 400 from my experience of large games, its just going to be a cluster fuck of camping and ammo spamming. That after the first 20mins of any story will fall apart in to a skirmish. Maybe if they limit it to 400 rounds but that they have stated its not going to be milsim. Perhaps I am just jaded but large games usually tend to be pretty terrible mess after a couple of hours of marshalls trying to herd cats. Giving up, just standing back and lobbing the odd pyro for effect.