So I picked up an AAP-01 about 6 months ago, and have been attaching mostly cosmetic pieces, with a few internal replacements. I bought a stronger short stroke spring and a very strong nozzle spring, as well as a few of the smaller shims from a short stroke kit. With these installed, I attempted to shoot in semi automatic. However, it fired in full auto. I checked the selector, and it was definitely supposed to be shooting one bb at a time. When I looked inside; it was obvious that the hammer had snapped. Fast forward a month later, I purchase a new CNC steel hammer replacement. After having installed that, I test the pistol again and have the same issue. So I removed all of the short stroke kit and nozzle spring, and yet again it was still having the same issue. I’m at a loss, even with a new hammer and the rest of the gun being stock the gun refuses to fire on semi auto. I’ve assembled and disassembled this thing a couple of times now, and I can’t figure out what part of the mechanism is failing. I was wondering if anyone on here had any ideas. Or maybe someone has had a similar experience with AAP-01s. Either way, at this point I can’t recommend this gun as a platform. It has failed in a couple major ways that just don’t make it worth it against a hi capa build or a Glock build. Thank you for your time!