Sig Sauer

Sig Sauer P320 24 Round Magazine Kit

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Sig P320 Carry Optics / Limited Optics Magazine Kit

This magazine kit holds 24 plus one and makes for a great starter mag. You an run 23 Round reloadable with this setup too.  This kit is perfect for those Sig Sauer P320 Carry Optic or Limited Optics shooters.

  • Holds 24 rounds of 9mm
  • Uses Sig 21 Round Mag tube
  • Utilizes the MBX Ultra Max Spring and Follower
  • Fits 140 (141.25mm) Magazine Gauge

Henning Group Magazine Extension PLUS 2 for Sig Sauer P320

This magazine extension is made specifically for the Sig Sauer P320 21 round magazines to fit the USPSA 141.25mm magazine gauge. When combined with a Grams Follower Kit, it will extend the capacity to 23 + 1 rounds.

You can also use it with the factory follower and spring which will increase the capacity by 1 round. It can also be used with 15 or 17 round magazines, and will fit inside the carry magazine well found on the Sig Sauer AXG PRO.

Our extension is machined from 6061-T6 aluminum and anodized. We offer them in black, red, blue and silver. When used with the factory follower and spring, the factory locking plate must be removed and not used. We use a spring-loaded detent to secure it to the magazine. It makes it super easy to take it on / off for magazine cleaning, and it is 100% secured. The detent is made from stainless steel and finished in Black Nitride for long life.

MBX "Ultra Max" Spring & Follower for Sig P320


*Note This Product will not lock slide back on last round fired

Before Inserting Magazine Into Firearm

New MBX competition follower & spring sets need to be loaded 4-6 times to capacity preventing follower popping out when new , insuring spring set and the follower sits down in tube when new, this avoids any slide contact and damange to spring and follower voiding warranty as the competition follower is NOT held down by the slide stop and has minimal surface area , the competition follower is designed once spring is set to sit 1/4-3/8 below top of feed lips thus avoiding damaging slide contact with follower once magazine is empty.

Our Magazine Policies


1 Review

  • 5
    So far, they're great!

    Posted by Craig S. on Jun 5th 2020

    Needed a few extra magazines for USPSA matches. In case some got too dirty and I didn't have time to clean them between stages. Added 4 Taran Tactical bases to my previous Sig 21rd mags and all went well. So when I decided I needed a few more, I just ordered these already with the TTI bases on them.