ProMag Magazine, 5.7X28mm, 20 Rounds, Fits Ruger 57, Steel, Blued Finish
- Magazine body constructed of heat treated steel with black oxide Finish
- Injection molded magazine follower
- Magazine spring formed from heat treated chrome silicon 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.