The Sig Sauer Sig Cal-X Kit P320-M18 9mm Carry Coyote 17/21rd converts your manual safety P320 into the civilian configuration of the renowned M18 sidearm. This caliber X-CHANGE kit includes a 3.9 inch coyote-tan PVD coated stainless steel slide, carry-length grip module, and a complete recoil spring assembly, all designed to deliver the same accuracy, reliability, and durability demanded by military users. The slide features the SIG-LOC MHS optic footprint, ready to accept the ROMEO-M17 red dot (optic not included), and comes equipped with SIGLITE night sights for confident low-light aiming.

Ideal for defensive carry, training, and regular range use, this P320-M18 conversion kit provides a balanced carry-size pistol setup with generous capacity thanks to one 17-round and two 21-round steel magazines. The coyote-tan grip module offers secure, ergonomic control, while the integrated M1913 accessory rail supports lights or lasers to tailor the pistol to your needs. Whether you are updating an existing P320 or building a dedicated carry gun, this kit reflects Sig Sauer’s reputation for thoughtful engineering and consistent performance.

• Manufacturer: Sig Sauer
• Model: P320 M18 Cal-X Kit
• Caliber: 9mm Luger
• Action: Semi-Automatic (P320 platform)
• Barrel Length: 3.9 in
• Number of Magazines: 3 (1 × 17rd, 2 × 21rd)
• Capacity: 17- or 21-round magazines included
• Optic Footprint: SIG-LOC MHS, ROMEO-M17 compatible
• Night Sights: SIGLITE Night Sights
• External Safety: Manual Safety Compatible
• Threaded Barrel: No
• What’s In The Box: Slide assembly, barrel, recoil spring assembly, carry-length grip module, three magazines