This ProMag 20 Round magazine is for Ruger 57 handguns chambered in 5.7x28MM. 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
- 20-round magazine
- Fits Ruger® Ruger-57™ 5.7x28MM pistols
- Magazine body constructed of heat treated steel with black oxide finish
- Injection molded magazine follower
- Magazine spring formed from heat treated chrome silicone wire
- Made in USA
ProMag magazines are designed utilizing both traditional stamping and welding of heat-treated high carbon steel, and modern precision injection molding of mil-spec polymer compounds. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects. Made in USA.
