Caliber/Gauge
9mm
SIG-A3 A 13-rd magazine for the Sig Sauer P228 pistol in 9mm. Constructed from heat-treated blued-steel, with a follower, lock-plate, and base-plate molded from a proprietary DuPontĀ® Zytel? based black polymer; and using a spring wound from Chrome-silicon wire and heat-treated for strength and reliability.