The SIG Sauer Medium Grip Module for the P320, M17, and M18 (brand part no. 8901478) is a factory-replacement polymer grip shell sized to SIG’s medium frame dimensions. Molded in black polymer, it lets owners of the P320 modular pistol system change grip size without any gunsmithing, since the fire control unit, not the grip module, is the pistol’s serialized and regulated part. Because it is a Title I accessory, this module ships and transfers like any other gun part, with no FFL or background check required. It is a straightforward way to fit a P320, M17, or M18 to a different hand size or preference.

Key Specifications

• Fits the SIG Sauer P320, M17, and M18 family of modular pistols.
• Sized Medium, matching SIG’s factory medium grip module dimensions.
• Molded from black polymer for a durable, low-maintenance grip.
• Functions as a Title I accessory, since the P320’s fire control unit, not the grip module, is the pistol’s serialized part.
• Swaps in without gunsmithing, letting owners change grip size without sending the pistol to a smith.

Frequently Asked Questions

Does buying this grip module require an FFL transfer? No. On the P320 platform, the grip module is a Title I accessory; the serialized fire control unit is the regulated part, not the grip module.

What pistols does this grip module fit? The SIG Sauer P320, M17, and M18 family of modular pistols.

What size is this grip module? Medium, matching SIG’s factory medium module dimensions.

Buy the SIG Sauer Medium Grip Module

Dial in the fit of your P320-family pistol with this SIG Sauer grip module, part of our full pistol grips lineup. Order it from our Lubbock, Texas gun shop for fast, insured shipping.