C Products set out to re-design and perfect the Colt pattern 9mm magazines for the AR-15. With the DURAMAG SS(TM) you can feel confident that it will feed the widest variety of 9A-19 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(TM) SS. Available in 10rd, 20rd, and 32rd capacities. 410 Stainless Steel body EverFlex(TM) anti-fatigue spring Advanced Geometry Follower(TM) Mfg: C-Products