I was testing out my aps 2 (Bought off ebay). Put it together and noticed that the bolt I screwed in towards the front didnt screw in. I keep trying and looking at it, and found out the threads on the outer barrel were striped. The gun stays togher with one bolt, and is fine when shooting targers, but when you move it around a lot you can kinda tell. I am thinking I can re-tap the threads at a biger size. Does anyone know anything else that will work?