Hi there, new M&P owner and fanboy here. I just traded into a fullsize M&P40 Range Kit. I love this gun, and hate that i put off getting one for so long. The test fire date is 10-24-2011. What "gen" would it be? Is this the gen that had the issue with the slide lock? Is the slide supposed to slam shut upon inserting a full mag? Excuse the newb questions, just want to make sure everything's squared away before I put this thing through competition. Also, does anyone make upgraded/aftermarket parts such as slide locks, takedown levers, etc? I know apex tactical makes internal parts and the like. Thanks in advance and thanks for the great forum.