Good afternoon, all. It's been a while since I've been able to post, but glad to have this chance. I hope someone will be kind enough to help me with this embarrassing problem (no, not that one). I just brought home a SIG M400 Enhanced. The one issue is that the magazine release seems to be incorrectly installed. Having no experience with this fancy machine, I'm at a loss as to whether I'm doing something incorrect or it's actually a problem. The magazine inserts cleanly. However, the magazine release on the right won't depress. I can pull it out about a 1/4", but not depress it. The only way I've found to release the magazine is to take a small hex driver and depress the pin in the middle of the release. Thanks kindly..