MrTea

Standard 30-round style stanags that only take 30 BBs? Nuprol make em. Can select 30 or 140 BBs with a small switch.

If memory serves, there was nothing done to the RIF unless it had been reversed prior to being sold. I don't think i've got the guys discord anymore either annoyingly so I can't ask. Edit: I do have it and have shot them a message.

@ak2m4 Measured at 480mm. This doesn't mean the person who owned it before me changed anything but why would they go for a shorter brass inner barrel?

Funnily enough, it's a full/non-ported cylinder. I 100% sure of this as I kept all the parts/spares from this build in it's own box so I didn't get them crossed with anything else.

I'll take the current setup and use the stock barrel and see what happens to the FPS. Should give an idea as to whether the barrel is causing significant FPS drops. If this turns out to not be causing large FPS drops, i'll test the airseal afterwards. Sound good?

6.12mm yes, 360-ish long IIRC and a full/non-ported cylinder.

That's annoying. The air seal was perfect when I originally changed out the stock compression parts but I can definitely go back and check again when I get the time.

That was what I was going to do initially however it appears his XT springs don't go past M150. Up until this point, it's exactly what I was using. Not yet. Now i'm closer to the limit, and have it chrono-ing consistently, i'm going to give it a test on 0.36g BBs to see how it's performing.

Actual progress this time around but additional confusion. I tried sanding down the Maple Leaf MR hop rubber feed lips. No matter how little I took each time, I could never get a rubber that resulted in consistent FPS readings - at one point I got an FPS reading of ~800 so IDK 😅 I've been messing with different hop rubbers trying to find one that consistently works especially when the stock hop rubber ended up splitting when changing it over. I was going to try the a ML Macaron 60 degree as i've never had an issue with them before and they just worked. During the process of installing it I noticed that the hop unit wasn't applying hop evenly, it was applying too much pressure on the right side resulting in uneven hop. I think this is simply due to the way the hop unit is designed that makes the hop arm slightly off center. Happily I managed to remedy this quite quickly by using a small o-ring that I had lying around which I think is for a MOSCART fill valve? All I did was just put this between the body of the hop unit and the hop arm. Before anyone mentions it, yes the screw is in the wrong side of the hop unit and no, this isn't what was causing the issue with the misaligned hop arm Now that I had sorted that I moved onto changing the hop rubber. I have a prommy purple I was going to try out but for some reason I just wanted to try a Maple Leaf Macaron yellow/60 degree just because they've worked flawlessly on everything I've put them on. I also installed the bucking with the Gearparts Omega 70 nub from AK2M4 and it worked. I am so mad. I am confused as to why this works. Before I tested this, i'd bought and installed a SHS M160 spring to creep up the FPS. The spring is very twangy (if that makes sense) and it's pretty annoying. Since starting this build, i've changed which outdoors site I go to and they allow 450fps for DMRs so i've still got a bit of headroom that i'd have to buy an M170 equivalent to get to. Is a SP160 the same as a M170? Could it be the MR hop bucking didn't work as the hop window on the inner barrel is too small causing inconsistent contact? I am at a loss as to why this suddenly works... I want to buy another ML MR hop rubber and try it but I feel like if I disturb the hop rubber in the slightest it's gonna throw a fit and not work anymore.

@grumio Have you found a hop rubber that will work properly with this hop unit design or are you still using a standard/stock one?

Shotguns are generally single or tri-shot with tri-shot being the more common from what i've seen. Tri-shot means they have 3 barrels and shoot 3 BBs at once. Some tri-shot shotguns do have the option to fire 6 BBs. Spring shotguns are fun but kind of hard work as they have strong springs that you have to pump but tend to be the cheapest, often coming in under £100. The next step up are gas powered shotguns which are incredibly fun. Much easier to rack than a spring shotgun but now you have to buy gas to power them and they can develop leaks over time but it's totally worth it. As for price, you're looking about £150-£200 range new. I think i've still got my spring shotgun sat around somewhere. Should really get that put up for sale.

You're correct. Mid-caps, when loaded, are under constant spring pressure which is what feeds the BBs into the AEG. As these don't have a loading window/port like high-caps, you will need a speedloader if you don't already own one. Personally I run the super cheap plunger style things to fill my P90 mags.

As others have stated: P90 high capacity magazines suck simply because of the way they're designed - you have to remove them from the gun to wind them up. I'd suggest buying what are called 'mid-cap' magazines. These hold less BBs than a high-cap but do not need to be wound-up once loaded with BBs. They will feed BBs until they're (pretty much) empty though the odd few may remain. The only difference with loading these magazines is that you will need a 'speed loader' as mid-caps have no loading window where you pour the BBs in. Take a look below - they're all hyperlinked so you can just click on them: BullseyeCountrySport has 68 round CYMA mid caps in stock. £10 each. Shipping is about £5-£8. Fire-support has a box of 5x King Arms 100 round P90 magazines in stock. £62 + postage. AirsoftSupplyDrop a box of 4x MAG branded 170 round P90 magazines in stock. £90 + postage. I've never had an issue with swapping different brand P90 magazines between different brands of P90 AEGs as they're mostly the same design IIRC but i'm sure someone can correct me on this if i'm wrong. I can vouch for the CYMA and King Arms magazines both working well but the quality of the magazines from King Arms is much better in my personal opinion. Hope this helps and i'm happy to answer any questions

I have a Cybergun/VFC AEG Scar-H. It's a nice gun with good externals but the mags are expensive to get a hold of (about £15-£20 per mid-cap) from Asian retailers. I haven't worked on it internally yet but i've been told that VFC internals on AEGs are pretty shit. IIRC it has a standard V2 gearbox meaning upgrades are plentiful and cheap. The only parts that aren't standard are the hop unit and nozzle (length is like 35mm or something) but Maxx make a CNC rotary hop unit for Scars that will fit the H apparently. You'll struggle to find one new at a reasonable price due to trademarks and availability - The only retailer I know of with them in stock has them priced at 400 euro. I got lucky on the forums here and snagged it for about £100 plus £20 for a replacement part that was missing. Double Bell make a Scar-H which has no trademarks making it cheaper than other AEG Scar-H models but the magazines are still pushing the £15-£20 price range area but with the RIF being £200-£250 it's still a significant investment. I can't comment on the quality of the internals having not owned or worked on one. Personally, i'd suggest looking for a second hand one as you may be able to get a rifle + mags but from what i've seen they rarely come up for sale. Even when they do come up, unless you get really lucky, they're great examples that have been cared for, upgraded and the owners demand a good price for them. If there's anyone super knowledgeable about AEG Scars reading this, i'd love to pick your brains over some stuff. Please PM me.

What hop rubber did you put in it? Try going back to the stock one if you have it. I've always used Maple Leaf Macaron (yellow) bucking on just about every AEG I own (with the omega nub) and had zero issues with it. As a super off-chance suggestion, are you running mags with strong springs such as EPMs? Try running a standard mid-cap and see what happens.

I didn't do anything special honestly. I just re-assembled it and left it how it was. Sorry I can't help more.

The left side of the rifle is solid and functions great. The right side functions but I wouldn't use the right side to change which fire mode. It's somewhat loose but it does move the way I'd expect.