Hi all, I recently bought a 2010 SLG and the majority of the time when I use it I have issues witht the bolt. I use it with an empire magna and after I shoot a few balls it tends to pinch one. I then have to recock the bolt by venting some of the air out of the nipple on the bolt cover. This happens frequently anf very difficult to play with. Has anyone got any ideas on what this could be? Thanks.