Caliber conversion kit that converts a manual-safety SIG P320 to the commercial M18 carry configuration. Includes 3.9 in slide, coyote carry grip module, SIGLITE sighting, and one 17‑ and two 21‑round magazines.
This SIG CAL-X Kit converts a manual-safety 9mm P320 into the commercial P320 M18 carry configuration, delivering a coyote-tan carry-length grip module, a 3.9 inch PVD-coated stainless slide, and included magazines for immediate use on the range. The slide features a SIG-LOC MHS footprint that accepts the ROMEO-M17 reflex sight; the kit ships without the optic installed and retains SIGLITE front night sight with a removable night-sight rear plate. Suggested compatible optic under $1000: the SIG ROMEO-M17 reflex sight is fully compatible with the SIG-LOC footprint and is a practical choice for this configuration. Typical applications for this kit include range training and competition or service-style carry/preparation where optics readiness and magazine capacity options are priorities.
Product Specifications
The kit is for the P320 M18 model.
The caliber is listed as 9mm Luger.
Includes one 17-round and two 21-round steel magazines.
The magazine material is specified as Aluminum.
A barrel is included: Yes.
The barrel length is 3.9 in [99.06 mm].
The barrel is threaded: No.
The recoil assembly is included: Yes.
The pistol size classification is Carry.
The sighting system is listed as SIGLITE Night Sights.
Optic-ready with a SIG-LOC MHS footprint (ROMEO-M17 compatible).
The grip color is Coyote Tan.
A manual safety is present: Yes.
The grip material is listed as Standard Polymer.
The UPC is 798681723973.
This CAL-X kit provides a factory-style conversion path to the commercial M18 carry layout with optics readiness and increased magazine capacity options. Its coyote finish and SIG-LOC sight footprint make it a practical option for shooters wanting a consistent, optics-capable carry configuration without altering their existing P320 fire-control unit. The included magazines and SIGLITE sighting hardware make the kit useful for range sessions and competitive or service-oriented setups.
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