Make sure the cut off is all the way up or down. I don't have mine in front of me to tell you if it needs to be up or down.
kwg
Actually, in a Springfield the cutoff is positioned in the middle notch (tab straight out) for bolt release/insertion. Having it up or down will prevent insertion/retraction of the bolt.
My guess without seeing the gun is that wildhobbybobby has described the issue.
