PROMAG AR15 5.56 20RD STL/PLY BLK UPC: 708279016370

The ProMag AR-15 M16 .223 5.56X45MM 20 Rd Steel Polymer Magazine is a 20 round magazine that fits AR-15, M16 .223, AND 5.56X45mm rifles and carbines. The magazine body is constructed of a proprietary DuPont Zytel based polymer and heat treated steel with a black oxide finish, steel upper and polymer lower housing. It features an injection molded magazine follower and the magazine spring is formed from heat treated chrome silicon wire.