Only the finest high carbon heat-treated steel goes into our steel magazine bodies. They are tig welded for strength. The springs are precision wound using heat-treated chrome silicon wire. Bases and followers are injection molded from polymers selected for their durability. Then, each and every step of the assembly is checked and double checked in order to maintain the same consistent level of quality. We're so sure of how good ProMags are, we've warrantied them for as long as you own them. Each and every ProMag is made right here in the U.S.A. **NOT FOR SALE IN: CA/DC/HI/IL/MA/MD/NJ/NY**
All ProMag Industries magazines are 100% warranted against manufacturer's defects. Unauthorized modifications or deliberate abuse will void warranty. Defective magazines will be repaired or replaced at the sole discretion of ProMag Industries.