I got my ears pinned back on this one. Seems that there is supposed to be some space left when the bolt comes back. If it hits, that means you need a new spring. I had a buffer, but couldn't tell if it was getting hit so I took mine out and put a piece of masking tape in there. I haven't had a chance to shoot it yet to see if the bolt hits the tape. Some smart ass said to stick your friends finger in there and he would tell you if it hits. ho,ho.