Fits many 1911 model pistols in .45acp
Made of heat-treated, Nickel-plated steel
Components molded from DuPont black polymer
Spring heat-treated for strength and reliability
This ProMag 1911 Government Model Magazine fits a number of 1911 model pistols in .45acp. High-strength magazine constructed from heat-treated, Nickel-plated steel with a follower, lock-plate, and base-plate molded from a proprietary DuPont Zytel-based black polymer. It also uses a spring wound from Chrome-silicon wire that's been heat-treated for strength and reliability. Made in the USA.