Sig Sauer builds this factory extended magazine (part no. MAG-MOD-F-9-21) for the P320, P320 X-Five, and P250, holding 21 rounds of 9mm Luger in a blued steel body for shooters who want the maximum factory capacity on the full-size frame. It’s manufactured to Sig’s own factory tolerances so it seats and feeds exactly as intended, and it also fits CMMG’s Banshee and Resolute pistol-caliber carbines built with the compatible modular magwell option. That cross-platform fit gives owners running both a Sig P320 and a compatible CMMG PCC a shared magazine pool. For Sig Sauer P320 and P250 owners, this handgun magazine is a dependable high-capacity spare.

Key Specifications

• Chambered in 9mm Luger, matching the P320/P250’s factory caliber.
• Holds 21 rounds, an extended high-capacity option for the full-size frame.
• Fits the Sig Sauer P320, P320 X-Five, and P250.
• Also fits CMMG Banshee and Resolute PCCs built with the compatible modular magwell.
• Finished in blued steel for a traditional, corrosion-resistant body.

Frequently Asked Questions

Does this magazine work in a CMMG PCC? Yes, it also fits CMMG’s Banshee and Resolute pistol-caliber carbines built with the P320-pattern modular magwell.

Is this a genuine Sig Sauer factory magazine? Yes, manufactured by Sig Sauer to P320/P250 specifications.

Buy the Sig Sauer P320/P250 21-Round 9mm Extended Magazine

A high-capacity factory magazine keeps a P320 or P250 topped off for the range. Order it from our Lubbock, Texas gun shop for fast, insured shipping.