A friend of mine has a new XD 40 compact. Out of about 100 rounds, he'll have 2 or 3 times where the slide lock engages in the middle of shooting a mag. Two different people have shot this gun with the same results. He brought it to me to look at. I figured that the slide stop tab was too long and possibly touching the upcoming rounds in the mag. When I looked at it, that is not the case. There is plenty of clearance. The spring tension to keep the slide stop down seems to be adequate. I have not shot this gun myself, but right now I am at a loss as to what could be causing this problem. Does anyone have any ideas on what this could be ? thanks