Year after year, ProMag has increasingly become one of the leading manufacturers of firearms magazines in the world. Gun enthusiasts and law enforcement personnel have agreed, be it for recreational "plinking", competition shooting, or law enforcement, Promag is the source you can count on.

This 20 Round magazine for the Ruger 57 pistol in 5.37x28mm. 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. ProMag magazines include a lifetime guarantee, if you ever have a problem with their magazines; simply return them to ProMag for replacement.

Features and Specifications:
Caliber: 5.7x28mm
Capacity: 20 Rounds
Body Material: Heat Treated Blued Steel
Spring Material: Heat Treated Chrome-silicon Wire
Follower Material: DuPont Zytel Polymer
Follower Color: Black
Polymer Base Plate
Color: Black

Fits:
Ruger 57 Models