This is a factory SIG P320 21-round magazine in 9mm.

This also fits full-size SIG P250 and M17 pistols.

Featuring precision-engineered steel construction, this magazine promises unmatched durability and performance. Capable of holding up to 21 rounds of 9mm ammunition, this is the best magazine for P320 pistols.

This P320 magazine also features quality SIG components, such as an anti-tilt polymer follower, precision-wound steel spring, and a textured plus 4 round grip extension. The polymer base pad can be removed easily when needed, making any cleaning or maintenance very simple.

If you’re looking for an effective upgrade to beef up your P320/P250 pistol, this magazine is just what you need. Pick up a few of these P320 21 round magazines at The Mag Shack!