Sig Sauer P320, P250 9mm 21 Round Magazine


  • Factory magazine
  • Fit: SIG P320 and P250
  • Capacity: 21 round
  • Material: Precision-engineered & coated steel
  • Follower: Anti-tilt, polymer
  • Right-facing witness holes

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This is a factory SIG P320 21 round magazine, and fits SIG P320 and P250 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!



Weight 8 oz




Customer Reviews

Based on 11 reviews
Adriaan G.

Can go plinking without changing mags as often! Great mags.

Jarrod B.
21 Round Fun Stick!

This is my second 21 round p320 mag so now I can burn through almost a whole box of ammo with just two mags. So with ammo prices what they are lately, I can go broke even faster! All kidding aside, it's a great mag and p320 is an excellent platform. It's such an easy pistol to customize to your liking. It's really quite addicting once you realize all the choices you have. You can truly create your own custom striker fire pistols. Looks like ammo prices are finally starting to fall a little so maybe I'll be able to afford to continue to fill this bad boy up!

Rick R.
Factory Mags

The Mag Shack is my Go To store when I need factory mags! Great prices.

Brian M.
Sig P320 21 rd.

Great magazine and can be used in lots of 320 modular combinations. Fits flush with Wilson Combat carry 2 module but extends a little with Sig compact grip module. I use them with all though! As always fast shipping and excellent service from 'The Mag Snack'. I have ordered quite a few items from and will continue to use 'The Mag Shack'!

Mark L.

Good price great service