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PROMAG MAG GLOCK 21 30 45ACP 22RD STEEL INSERT
22-round magazine – Fits Glock Model 21 and 30 .45 ACP – Magazine body constructed of a proprietary DuPont Zytel based polymer – Magazine body has full length steel internal insert stamped and welded like the factory magazine – Injection molded magazine follower – Spring is made from heat treated chrome silicon wire – Made in USA