These are brand new high quality magazines made by ProMag Industries. All ProMag magazines are manufactured from only the finest quality materials available. Magazine bodies are heat treated high carbon steel and tig welded for strong seamless welds. The springs are precision wound using heat treated chrome silicon wire. The base and follower are injection molded from polymers, selected for their strength and durability. ProMag warranties their magazines will fit, feed, and function perfectly for life to the original purchaser.