Alright. I just put in all the AGI PE parts the piston, spring, sear set, barrel and hop up rubber in. put it all back together. The first mag went through just fine. But then it wouldn’t shoot. The trigger went back just fine and I could feel it slide off the trigger sear but it just didn’t let the piston go. So then I messed around with it some and figured out that it would shoot if I pulled the trigger and pushed the back of the bolt really hard and it would fire. I am really puzzled on why this is happening so any help would be greatly appreciated.