The durability of steel with several improvements over the competition to aid in reliability.
Duramag™ set out to re-design and perfect the Colt pattern 9mm magazines for the AR-15. With the Duramag SS™ you can feel confident that it will feed the widest variety of 9MM ammunition, even defensive hollow points, and heavy sub-sonic loads. 9mm AR-15 magazine have always been notoriously stubborn to load, but loading the last round is just as easy as loading the first round with a Duramag™ SS. Other magazines fail when filling to capacity: Duramag™ will outlast and outperform all others, first round to last. These magazines are made with a 410 stainless steel body that is laser welded for strength and durability, and feature and advanced geometry follower that remains level for consistent feeding.