Promag AR-15 223 Rem,5.56 Nato 65Rd Drum With Window Made In The USA, The AR-15 65-Round Drum Magazine With Window Is constructed Of Dupont Zytel Polymer With Stamped Steel Feed lips And Injection Molded Follower. It Also Has a Spring Formed From Heat Treated Chrome Silicon Wire. Caliber: 223 Rem,5.56 Nato Capacity: 65 Finish: Black Model: AR-15 Material: Polymer Model Fit: AR-15 Capacity: 65 Manufacturer: Promag Mfg Number: DRMA24 Model: AR-15