Sig Sauer MAGAZINE 320 9 FULL 21RD M17 COYOTE

Product Description

The Sig Sauer MAGAZINE 320 9 FULL 21RD M17 COYOTE is a factory 21-round magazine designed for the Sig Sauer P320 full-size pistol chambered in 9mm, finished in the M17 Coyote color.

This magazine extends your capacity by four rounds compared to the standard 17-round P320 full-size magazines. The M17 Coyote finish matches the military M17 variant of the P320.

Sig factory magazines are built to the same specifications as the magazines that ship with new pistols. They ensure proper feeding and function in P320 platforms.

Key Facts

• Brand: Sig Sauer
• Capacity: 21 rounds
• Finish: Coyote
• Platform: P320 9mm full-size

P320 Full-Size Magazine Compatibility

This magazine is designed for full-size P320 frames in 9mm. The P320 modular system allows you to swap grip modules, but magazine compatibility depends on the grip module length, not the slide.

Full-size magazines will fit and function in full-size and carry frames. They will also fit compact frames but will extend below the magwell. Subcompact frames require subcompact magazines; full-size magazines will not lock in place.

If you are running a custom P320 build or an aftermarket grip module, confirm magazine length compatibility before ordering. Call 817-393-4000 if you need help matching magazines to your frame configuration.

21-Round Capacity vs. Standard Magazines

Standard P320 full-size magazines hold 17 rounds. This 21-round version adds four extra rounds in a magazine body that extends slightly below flush-fit magazines.

The extended length provides a longer gripping surface, which some shooters prefer for reloads or for larger hands. The added capacity is useful for range work, competition, or any application where magazine changes need to be minimized.

Because the magazine body is longer, it will protrude below the grip on compact or carry frames. On a full-size frame, the extension is minimal and many shooters find it improves handling during reloads.

What the M17 Coyote Finish Means

The M17 designation refers to the military variant of the P320 adopted by the U.S. armed forces. The Coyote finish is the tan color used on military M17 pistols and magazines.

If you own an M17 or M18 pistol, or a commercial P320 with a Coyote or FDE frame, this magazine will match the color. It will also function perfectly in any standard P320 full-size 9mm, regardless of frame color.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer serving North Texas and the DFW area since 2007. We offer gunsmithing services on site and handle firearms transfers. Browse our full selection of pistol magazines or call 817-393-4000 to place an order or ask questions.

Frequently Asked Questions

Q: Will this 21-round magazine fit my P320 Compact or Carry?

A: This magazine will lock in and function in P320 Compact and Carry frames, but it will extend below the grip because it is designed for full-size frames. It will not fit P320 Subcompact frames, which require shorter magazines. Call 817-393-4000 if you need help confirming fitment for your specific frame.

Q: How does the 21-round magazine compare to the standard 17-round P320 magazine?

A: The 21-round magazine holds four more rounds than the standard 17-round P320 full-size magazine. The body is longer, which extends slightly below a flush-fit 17-round magazine when seated in a full-size frame. The added length also provides more gripping surface during magazine changes.

Q: Is the Coyote finish the same as Flat Dark Earth?

A: Coyote and Flat Dark Earth are both tan finishes, and they are visually similar. Coyote is the specific color designation Sig Sauer uses for the M17 military contract pistols and accessories. This magazine uses the M17 Coyote finish, which will closely match M17, M18, and most FDE P320 frames.

Q: Can I use this magazine for USPSA or IDPA competition?

A: Magazine capacity limits vary by competition division. USPSA Production division allows up to 141.25mm overall loaded length, which typically limits 9mm magazines to around 140mm or roughly 21-23 rounds depending on the magazine design. IDPA limits magazines to division-specific capacities, often 10 rounds for some divisions. Check your division rulebook or call 817-393-4000 if you need help selecting magazines for a specific competition format.

Q: Will this magazine work with .40 S&W or .357 SIG P320 pistols?

A: No, this magazine is designed for 9mm P320 pistols. The P320 platform uses different magazines for 9mm, .40 S&W, and .357 SIG due to differences in cartridge dimensions. Using the wrong magazine caliber will cause feeding malfunctions and may damage the magazine or firearm.

Q: How do I order this magazine from Western Sport?

A: You can order through our online shop or by calling 817-393-4000. Magazines do not require an FFL transfer and can ship directly to your address in most states. Texas residents can also pick up at our Roanoke location. Call if you have questions about shipping restrictions or need help placing an order.

Additional information