ProMag S & W 645, 4506, 4566 & 4586 Series .45 ACP (8)Rd Blue Steel Magazine.
An single-stack 8-rd magazine for the Smith & Wesson 645, 4506, 4566, and 4586 series of pistols in .45 ACP . Constructed from heat-treated blued-steel, with a follower, lock-plate, and base-plate molded from a proprietary DuPont® Zytel™ based black polymer; and using a spring wound from Chrome-silicon wire and heat-treated for strength and reliability.
