Upgraded the spring in my V4 MP7 and it was running like a dream on 11.1V for a few hundred shots (270fps!)
Loaded a new mag and it wouldn’t feed and fire. Mag prime still works fine.
Pulled it apart, everything looked fine. I figured it was the anti- reverse latch. Took the oportunity to fix the absolutely hopeless seal it had with a brown O-Ring a Gen 8 cylinder head and nozzle I had laying around which looks to be the identical size.
Put it all back together and everything appears to be working fine, can even feel heaps of air coming out of the barrel, but it still won’t fire a single gel.