This is a ProMag factory magazine for Sig P229 guns. This is a 12-round 40sw/.357 replacement magazine at a great price. Constructed from heat-treated blued-steel, with a follower, lock-plate, and base-plate molded from DuPont Zytel based black polymer. The spring is made from carbon silicon wire for long life and retention. This magazine features ProMag ANTI-FATIGUE LOAD’UM up and STACK’UM up chrome silicon springs.
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Spend more time shooting and less time loading your magazines. We recommend using a magazine loader
with this magazine. Select the loader shown below.