Recently i picked up a g&g mp5 blowback, and the thing has given me alot of trouble.
I've seen that some blowback Aegs don't operate correctly with the stock battery because it's not strong enough to operate the blowback action if you haven't already try a better battery
-Bennett https://www.youtube.com/user/SieUbermensh/videos
it's a pneumatic blowback model, so it doesn't have the extra resistance that regular blowbacks have. Also i'm running it on 9.6 1600 mah batteries which should be more than enough to pull back a m90-m100 spring.
Oh Ok I tried, Goodluck man
-Bennett https://www.youtube.com/user/SieUbermensh/videos
i took the gearbox apart a bunch more times and then around 2 am last night i had a hunch, My hunch was right. The cause of the locking up was that g&g pistons are completely flat on the back end, and that caused it to catch on the spring as it got pulled back. I've never had that problem with g&g pistons..