I just received my Mcrees Precision G7 chassis for my Remington 700 5R in .300 Win Mag. Let me start off by saying that it's really well made and I like it so far. As for my question: I'm using a Magpul Pmag for the magazine. When I tried the magazine in the chassis before installing it fit and locked up tight. After installing the action however, the magazine no longer locks in place. Looking in the receiver it appears that the lips of the magazine are hitting the bottom of the action. The action screws are torqued to the required 65 inch pounds. What's the best way to proceed? Should I shave down the feed lips on the magazine?