I have had Fx's, the company I work with for pest control solely uses Fx's. And I work on them if they need me to tune them or if mess up. So that's atleast 12 Fx's that I have had my hands on WITHOUT problems.
Since the beginning of AEA they have had problems and continue to do so, have they gotten better? Yes, but the guns they make are powerhouses for that reson, the lack of QC is what is concerning.
I bet Hatsan has had more QC problems than any other company, and yet every experience I have had with QC problems have been met with speedy responses and parts being sent to me in amazon delivery fashion. Can you say that about AEA? I've personally owned 3 AEA, and have shot 5 other ones. 3 of the 8 were problem free, all of which could've been addressed but never did even with the high amount of complaints. Guns arriving with missing parts, poppet valves not lasting long enough, magazines breaking within 200 shots, not cycling properly, semi autos having so much blockback that it pushed the projectile back into the main block and jamming the cocking lever.
Can you imaging shooting this thing with a magazine and the lid to the mag breaking off in your face? The only two AEA that I have had fantastic results with are the AEA Max in 357, the AEA Standard and AEA Varmint.
I don't care that they are a chinese company, or that AEA makes the strongest airguns for an affordable price, just don't cut corners. They surpass handguns in terms of power and now centerfire cartridges.