Our Handmade precision rifle mag carriers will fit most precision mags on the market. This holster has an multi retention device built in for retention adjustment which allows you to carry most precision mags. Comes with the Allen key for adjustment. The bottom is mostly closed to keep dirt and debris from getting in the carrier. Every edge has been beveled, sanded and polished. The combat loop will fit up to a 2" belt and is very secure with a built-in locking system.