ProMag Industries

ProMag magazines are made in the USA and backed by a lifetime guarantee against manufacturer's defects. Magazine springs are precision wound using heat-treated chrome silicon wire and each and every step of the assembly process is checked and double checked in order to maintain the same consistent level of quality. Features : - 40-Round Magazine - Fits Ruger Mini-14 .223 Cal / 5.56X45MM Rifles - Magazine Body Constructed of a Proprietary Dupont Zytel Based Polymer, and Heat Treated Steel with Black Oxide Finish - Steel Upper, Polymer Lower Housing - Injection Molded Magazine Follower - Magazine Spring Formed From Heat Treated Chrome Silicone Wire - Made in the U.S.A.