PROMAG MAG AR15 223REM 5.56 42RD BLK POLYMER

A 42-rd magazine for AR-15 / M16 rifles and carbines. The magazine body and follower are constructed of a proprietary DuPont� Zytel� based polymer to ensure a long service life. The springs are made from heat treated Chrome-silicon wire for increased reliability and smooth feeding. New and improved design!