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.
DuPont Zytel Polymer Construction
Heat treated Stainless Steel Internal Spring
Injection Molded Polymer Follower
40 Round Drum Magazine
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