These AICS magazine by MDT are constructed from high strength steel and are given a Cerakote Elite finish for excellent durability and corrosion resistance. They have a capacity of five rounds based on magnum cartridges such as .300 PRC. Note: These magazines have a 3.850” CIP length. The standard length on the majority of MDT long-action chassis’s is 3.715” unless noted otherwise in the description. Check to make sure your chassis/rifle will accept the longer length. Not compatible with .300 Remington Ultra Mag, .300 Weatherby, and similar cartridges. MDT 3-Pack LA 300 PRC 3.85 CIP 5rd Blk Metal Magazine Bundle 105123-BLK-MDT-KIT-3X