Sig Sauer Cal-X Kit P320-M17 9mm Full Coyote 17/21Rd

The Sig Sauer Cal-X Kit P320-M17 9mm is a complete conversion system that transforms your manual safety P320 into the civilian counterpart of the U.S. Army's MHS-selected M17. This full-size kit delivers military-grade capability in Coyote tan, giving you a proven platform built on the same modular foundation that won one of the most competitive military procurement processes in firearms history. If you shoot a P320 and want to upgrade to M17 specs—or build a second complete upper—this kit gives you everything you need in one package.

Built around the same design principles that earned Sig Sauer the MHS contract, the M17 is known for reliability, modularity, and performance. The Cal-X approach lets you keep your existing lower receiver and grip if you own a compatible P320, or pair this kit with the grip module included here to build a full M17 from scratch. The Coyote tan PVD-coated slide and matching grip module deliver that distinctive mil-spec look, while the optic-ready slide accepts the ROMEO-M17 reflex sight (sold separately) via the SIG-LOC MHS-standard footprint—future-proofing your setup for modern optics.

You get a practical magazine ecosystem with this kit: one 17-round mag and two 21-rounders, all steel construction. The 4.7-inch barrel is paired with the recoil spring assembly, both included. Night sights come standard—SIGLITE front with a removable night sight rear plate—so you're ready to run it day or night. The M1913 Picatinny rail under the dust cover accepts lights and lasers. This is a serious conversion kit for shooters who want proven, modular 9mm firepower.

Key Features

• Complete Cal-X conversion kit: slide, barrel, recoil spring, grip module, and magazines
• Coyote tan PVD-coated full-size slide with M1913 accessory rail
• Optic-ready with SIG-LOC MHS footprint for ROMEO-M17 and compatible red dots
• 4.7-inch barrel and recoil spring assembly included
• SIGLITE night sights with removable rear sight plate
• Manual safety for enhanced control
• Magazine package: one 17-round and two 21-round steel magazines
• Coyote tan polymer grip module

Specifications

Frequently Asked Questions

Will this Cal-X kit work with my existing P320?

Yes—if you own a P320 with a manual safety and a compatible grip module, you can use this kit's slide, barrel, and recoil spring with your current lower. If you don't have a P320 frame yet, this kit includes a Coyote tan grip module so you can assemble a complete M17.

Does this kit come with an optic?

No. The slide is optic-ready with the SIG-LOC MHS footprint and will accept the ROMEO-M17 and other compatible reflex sights, but the optic is not included.

What magazines come in the kit?

You get one 17-round magazine and two 21-round steel magazines. All are factory Sig Sauer specifications for 9mm.

Is a threaded barrel included?

No. The 4.7-inch barrel included is non-threaded. If you need a suppressor-ready setup, you'll need to source a threaded barrel separately.