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This factory Sig Sauer magazine is the go-to extended option for full-size P320 and P250 pistols running 9mm. With 21 rounds of capacity, you get a meaningful boost in firepower without the bulk of aftermarket alternatives that often underwhelm in the field.
The magazine features nitride-coated carbon steel throughout, paired with a high-tensile spring and polymer follower that keep feeding smooth and reliable through thousands of rounds. The anti-friction coating reduces friction on the feed lips, and the numbered witness holes let you count rounds at a glance without manually unloading the magazine.
Fits P320 9mm models including the XFIVE, XFULL, XCARRY, FULL, and CARRY sizes. Also works with the P250 full-size frame, and P211 pistols when equipped with the factory magwell. The extended baseplate adds roughly half an inch to the overall length, creating a full grip for people with larger hands while staying practical enough for duty or range work. If you're running an X-Series grip module, the compatible baseplate works seamlessly with the magwell funnel.
This is the magazine Sig includes with their M17 and M18 military models for good reason. Real-world testing shows factory Sig mags run consistently, while budget aftermarket alternatives frequently develop feed issues and jams. When it comes to something as critical as magazine reliability, the factory option performs.
The 21-round extended magazine is designed for full-size frames and will protrude noticeably from compact or smaller grip modules. For best results and proper fit, use this magazine with full-size, carry, or X-series frames.
Yes, this magazine is compatible with P320 XFIVE, XFULL, XCARRY and standard FULL size frames. The baseplate design works with magwell funnels found on X-series guns. P211 pistols need the factory magwell installed for compatibility.
Factory Sig magazines have proven themselves in military service and heavy civilian use with consistent feeding and durability. Aftermarket budget options often develop feed lips issues and jams that make them unreliable for serious use. The small price difference is worth the peace of mind.
The M17 and M18 are military variants of the P320 full-size and compact respectively. This 21-round magazine works perfectly with the M17, though the compact M18 will show significant magazine protrusion. Use standard 17-round magazines for flush-fit carry.
| UPC | 798681555253 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG-MOD-F-9-21 |
| Brand Fit | CMMG |
| Caliber/Gauge | 9mm |
| Capacity | 21 |
| Color | Black |
| Length | 8.4 |
| Model | |
| Model Fit | Banshee, Resolute |
| Package Height | 1.8 |
| Package Width | 4.2 |
| Product Type | Accessory-Magazines |
| Quantity | 1 |
| Shipping Weight | 0.35000000000000003 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
| Style | Extended |
| Units per Box | 1 |
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