Sig Sauer Grip Module Assembly for P320/P250 - Compatible with 9mm, .357 Sig, .40 S&W

The Sig Sauer Grip Module Assembly for P320/P250 is the core that transforms your modular Sig platform pistol into a compact carry or duty gun. If you already own a P320 or P250 firing control unit—the serialized heart of your pistol—this grip module lets you swap calibers and ergonomics without buying a whole new gun. It's one of the smartest moves for shooters who want flexibility: install your FCU, pair it with the matching slide and barrel in your chosen caliber, and you've got a fresh gun ready to go.

This module ships in medium grip size and is compatible with 9mm, .357 Sig, and .40 S&W when paired with the corresponding slide and barrel assemblies. The modular design is what makes the P320 and P250 platform so practical for duty, sport, and personal defense—you get a serialized frame once, then build around it. It's the kind of smart engineering that appeals to shooters who think long-term about their gear.

Whether you're running multiple calibers at the range, setting up a duty pistol alongside a compact carry gun, or just experimenting with different ergonomics, this grip module is the backbone of that flexibility. Condition and finish will vary with your specific module; verify compatibility with your slide, barrel, and FCU before assembly.

Key Features

• Modular design works with your existing P320/P250 firing control unit
• Medium grip size for balanced control and concealability
• Compatible with 9mm, .357 Sig, and .40 S&W calibers (requires matching slide and barrel)
• Enables multi-caliber platform building without purchasing a full new pistol

Specifications

Frequently Asked Questions

What do I need to complete this grip module into a working pistol?

You'll need a P320 or P250 firing control unit (the serialized component), plus a slide and barrel chambered in your desired caliber—9mm, .357 Sig, or .40 S&W. The grip module alone is the frame and lower assembly.

Can I use this grip module with different calibers?

Yes, this grip module is caliber-agnostic. To change calibers, simply swap out the slide and barrel assembly for one in 9mm, .357 Sig, or .40 S&W while keeping the same FCU and grip module.

Is this grip module only compatible with P320 and P250?

This grip module is designed for P320 and P250 firing control units. Verify your FCU and chosen slide/barrel combo before assembly.

What grip size is this module?

This is a medium grip size, suitable for most hand sizes and offering a balance between control and concealability.