The MDT 105123BLK is a top-quality MDT Metal 300PRC magazine. This magazine, with its 3.850\" length, has been constructed from high-grade steel for maximum strength. Enhanced with Cerakote Elite, it offers superb durability and corrosion resistance. This magazine is compatible with Aics pattern DBM chassis and bottom metals that accept 3.850\" CIP length magazines, and can house up to 5 rounds based on magnum rounds.Please note, the standard length of a long action magazine in an MDT Chassis is 3.715\