Promag Ruger 57 5.7x28mm 20rd Blue

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 manufacturers defects. Made in USA.

Features :

• 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