Sig Sauer P320/M17/M18 Full Size Black Polymer Grip Module w/ Manual Safety

The Sig Sauer 8901478 is a factory full-size polymer grip module built for the P320 pistol platform and also fitting the M17 and M18 service pistols. Molded from durable black polymer, the module accepts P320 magazines chambered in 9mm Luger, .40 S&W, and .357 SIG, giving shooters a single interchangeable chassis option across all three calibers.

Designed as a direct OEM replacement, the grip module features an integrated manual safety for users who prefer a thumb-activated safety lever on the grip frame. The Full Size chassis accepts flush-fit 17-round 9mm magazines and the equivalent capacity magazines in .40 S&W and .357 SIG, and fits P320 Full-Size, Compact, or Carry slide assemblies paired with a standard P320 fire control unit.

This grip module is the same full-size assembly shipped on factory M17 service pistols and serves as an aftermarket full-size chassis upgrade for the M18, which ships from the factory with a shorter Carry (Medium) size grip module. The grip module is a chassis component only and does not contain the serialized fire control unit.