I just put together an Aero glock mag AR9, FM bolt,BA barrel, ALG ACT trigger with standard springs, 8 oz extended buffer (based on blowback9's recommended system weight), ar15 spring, factory glock mags, DIY muzzle brake. My issues are varied. If I shoulder the rifle firmly or hold it against a wall, it short strokes and won't reset the trigger. if I shoulder it lightly, it will bump fire 3-4 rounds. if I don't shoulder it at all, it runs perfectly. can anyone point me in the right direction? Thanks
p.s. I tried a carbine buffer in it, bad idea