[Corleone]

I knew I was in for it when I wrote the whole gear timing part, but seeing as I spent so much time just narrowing down the problem, and comming to just that conclusion, I thought it was worth mentioning. It was the case on my friend's v2 gearbox (VFC HK 416), where he first got +-280 FPS on his new Systema 1J spring, and then when setting the gear timing differently (and only gear timing I might add) getting 330-340 FPS. We did this cause we both suspected that the nozzle was being pulled back before the piston slammed into the cylinder head. I also had huge problems getting my Echo1 P90 gearbox firing the BBs properly. It would not propel the first BB, but instead shoot two at a time every single time o.0 When test firing the gearbox outside the gun, it became apparent that the nozzle didn't position correctly. If any1 think it's an airseal problem, or that I changed multiple things at a time, save yourself the trouble. I was spending half a day just trying out different gear timings, and finally it would fire correctly. Now it shoots consistently 360-370 FPS, sadly way more than I want from the gun, so I needed to cut the spring a little.

The nozzle to hop-up seal was merely a side note, because it's a classic thing with the AR-15 series of guns. It will of course not fix this problem mentioned by George, but it's worth mentioning to everyone that cared to buy an Armalite. Please note that it's not for sealing between the hop-up unit and the gearbox, but the nozzle and the hop-up rubber sleeve. Buying and airseal nozzle might not give much of a performance jump, of course all depending on the quality of George's dboys nozzle.