Sig Sauer P320 X-Series Grip Module (Small) — 9mm/.357 SIG/.40

This Sig Sauer P320 X-Series Grip Module Assembly accepts a P320 firing control unit to convert a handgun to the X-Series full-size configuration. The module is described as compatible with 9mm, .357 SIG, and .40 Auto when used with the correct slide and barrel. The module is finished in black polymer and is intended for use on full-size P320 frames listed with a 4.70″ slide/barrel.

Key Specifications

• The manufacturer is Sig Sauer.
• The compatible model family is P320.
• The module is finished in black polymer.
• Compatible chamberings listed are 9mm, .357 SIG, and .40 Auto when paired with matching slide and barrel.
• Designed to fit a full-size P320 with a 4.70-inch slide/barrel as indicated in product data.
• The assembly does not include the extended magwell or the internal weight; both are not included.
• X-Series modules have compatibility constraints with magazines and will not work with baseplates marked with “SIG SAUER”; they are compatible with baseplates showing the SIG mark.

This grip module provides a direct way to configure a P320 into the X-Series full-size layout while maintaining a familiar polymer feel and factory fitment. It’s a practical option for shooters looking to change grip ergonomics or standardize parts across a P320 collection, provided slides and barrels for the listed chamberings are used. The module’s straightforward design keeps installation and maintenance simple for experienced owners and armorers.

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