Colin Allen

Cylinder head is generally 22mm OD, 1.5mm cross section. Piston head is generally 24mm OD, 2.4mm cross section AK2M4 sells some slightly larger piston head O rings for slightly larger cylinders; they are 24mm OD, 2.7mm cross section.

I completely agree; the concept is great and has potential and I hope that this particular iteration is the first step towards something impressive.

£10 postage and a bag of Haribos instead?

Indeed, although it is a great concept and the "blowback" is fun.

Fair enough; I was just making the point that one cannot even rely on Specna mags to work in Specna guns.

I saw one of these at our last outing; it was rather underwhelming in terms of response, range and giggle factor.

It is surprising how good some gearboxes look after a long period. I opened up the lad’s blowback G&G AKM on Sunday to deal with a low power issue, after it had not been opened for many years. Apart from a worn piston head O ring, it was pretty much perfect. it was still a bugger to do due to the stupid pneumatic blowback system.

Specna use more than one OEM; consequently, not all Specna branded mags work in all Specna branded guns.

He could try fitting a standard tappet plate and seeing how that goes; it might still need a different nozzle.

That seems to be the best way forward. I have never seen a tappet plate like that before.

They still might; stranger things have happened.

The nozzle is not fully engaging with the hop rubber lips. Is the hop unit pushed fully back against the gearbox? If it isn't, use some O rings in front of it to push it back. If it is, try longer nozzles or get a variable nozzle.

That seems reasonable.

A quick spray of WD40 and it will be good to go.

Buy a chrono!!!!!!!! Until you know what the energy is, you cannot make an informed decision as to which spring to use. However, I suspect that an M100 would probably be ok, or possibly not. As you have extended the barrel, did you also change the cylinder? I am not sure which cylinder the UTR comes with, but, if the porting is wrong for the longer barrel, you might see a drop in power.

Someone else posted three days ago stating that he is alive.

Indeed. There is no consistency in airsoft and tolerances are loose.

I have seen 21mm and 21.4mm. However, not all 21.4mm ones are the same length; there are marginal, but potentially significant, differences. However, it could be a timing issue or one of many other issues which can occur when you bring different parts together.

Possibly a marginally different nozzle length, a different profile, or slightly too tight on the cylinder head tube.

That should be ok for most M4 type barrel lengths. I use a similar one with a 360mm barrel.

That looks like the standard G&G cylinder; what is the inner barrel length?

It seems to have been a great day! What a fantastic report.

Today's airsoft adventure was a trip to the second game day at the new Dragon's Lair site in Essex; the lad and I were accompanied by his girlfriend Charlie, who is an accomplished real steel shooter. Around 55 people were present, fewer than two weeks ago but this may have been down to it being peak holiday season. The first game was a simple domination; the team that had the village flag up at the end would win. We started from the back of the end compound, which is definitely not the best place to start this game. Along with a group of team mates, I set off into the woods on the ridge to our left, intending to prevent the enemy outflanking our central push and, if possible, push them back and outflank theirs. We had a cracking fight in the woods and pushed them back almost to their start point; however, this had no impact whatever on the outcome of the game as the blue team quickly got their flag up and held on to it until the end. After a short break to reload and take on fluids (it was very hot), the game was reversed; a small group of us set off into the same woods, where we pushed forward past the village. There I encountered Charlie, whose stalking skills had come to the fore; she was amazingly still, moving just enough to engage new targets, which she rapidly despatched. We were soon joined by the lad and held our position until Charlie was hit by a wonderfully sneaky fellow who had flanked round us; the lad and I avenged her! The game ended with our flag up in the village. After another very necessary break, we played Hamburger Hill. We defended the ridge nearest the safe zone with three lives while the attackers had to raise their flag on the hut on the summit. The three of us took up position in a rather nice position among bushes under a low, spreading tree and engaged several attackers who we sent back to regen on a marshal positioned behind their team. I was then shot in the back; clearly the attackers had turned our left flank, although this seemed odd as one of our players was still in position there. After crawling out of the undergrowth I encountered two of our younger players and none of the enemy; when I asked them if they had just shot me, they told me that they had because they thought I was the enemy. I took up another position behind a bush about 5m further back. After potting a few attackers, I was hit by some shots from my right flank; assuming that the enemy had pushed up the main path up the ridge, I stood up to move back to my final position only for one of my own team to apologise for shooting me. This seemed to be becoming a habit. On the summit, I positioned myself behind a barricade, where I held out for a while until we were overrun. After lunch, Hamburger Hill was reversed. We struggled up the hill in the heat and pushed the enemy back; when I reached the summit, I witnessed the lad making a brilliant and successful run to raise the flag. Unfortunately, our time was exactly one minute longer than that of the blues. After taking on more water, we returned to the valley. As the attackers, we had to raise our flag at each of the following: the camo net building, the centre compound, and the end compound; one a flag was raised, that became our regen. We had infinite regens while the defenders had one life at each structure. The slopes on either side were out of play, so this was played straight down the valley. We quickly raised our flag at the camo net building and moved on the the main compound, which could only be entered by one door, which unsurprisingly proved to be a bit of a bottleneck. However, our assault team pushed through, took the compound and attacked the final one, where the flag was eventually raised. After another short break, during which a player was sent home for having a mag in his gun in the safe zone despite explicit warnings in the morning briefing, the game was turned around. In the first stage, we prevented the enemy getting the camo net building flag up for quite a long time; after potting loads of attackers, I was hit on a finger, which was the only exposed part of me. Defending the middle compound from a position in the back right corner, which covered the entrance, I was again hit after taking out a number of attackers. In the rear compound, I took up a forward position in a corridor at 90 degrees to the entrance, while two other colleagues covered it from close up. They did a great job of smiting attackers and preventing them breaking in until they were both eventually hit. Valhalla would welcome them as true heroes; Romans would laud their defence as being akin to that of Horatius Cocles. After that, I potted everyone who tried to storm the entrance and those who tried to flank it. The game ended when the attackers ran out of time. It was a very good, albeit very hot, day of airsoft which was well marshalled, well organised and well played by both teams. Charlie really enjoyed her second day of airsoft. Guns used: Me: Hurricane Kit Knight's Armament SR47 Double Bell AKMS ASG XP18 Commander (CO2) The lad: CYMA Zenitco AKS74U CYMA Zenitco AK105 ASG XP18 Commander (CO2) Charlie: G&G "Magpul" M4

Damn you! I really hoped that you were going to say that it was a pile of Austrian Hundehaufen, so I would not feel tempted to get an A1. Oh well, time to start sewing FIDF patches on the DPM.