The Grey Ghost Precision Match Grade Threaded Barrel (brand part no. BARREL-P320C-T-BN) is a drop-in replacement barrel built for the SIG Sauer P320 Compact in 9mm. Machined from 416R gun-barrel-quality stainless steel and held to a final dimension tolerance of plus or minus 0.003 inches, it’s built to tighten group sizes over a stock barrel while adding threaded versatility. The 1/2×28 TPI muzzle threading is optimized for suppressor use and ships with an O-ring and thread protector installed, so the pistol stays range-ready even without a can mounted. A SAAMI-spec 9mm match chamber and 1:10 twist rate round out a barrel built for serious carry or competition use.

Key Specifications

• Machined from 416R gun-barrel-quality stainless steel for accuracy and durability.
• Built to a match-grade drop-in fit for the SIG P320 Compact.
• Threaded 1/2×28 TPI and optimized for suppressor use.
• Ships with an O-ring and thread protector installed on the muzzle.
• Held to a tight plus or minus 0.003-inch final dimension tolerance for consistent accuracy.
• Cut to a SAAMI-spec 9mm match chamber.
• Rate of twist is 1:10 inch.
• Finished in black nitride for corrosion resistance.
• Measures 4.25 inches in barrel length.

Frequently Asked Questions

Does this fit the full-size P320? No, it’s built specifically as a match-grade drop-in barrel for the SIG P320 Compact.

Is it suppressor ready? Yes, the 1/2×28 TPI threading is optimized for suppressor use, with an O-ring and thread protector included for unsuppressed carry.

What chambering is this barrel cut for? 9mm Luger, cut to a SAAMI-spec match chamber.

Buy the Grey Ghost Precision P320 Compact Barrel

Tight tolerances and threaded versatility make this barrel a straightforward upgrade for a P320 Compact carry or range gun. Order it from Grey Ghost Precision through our Lubbock, Texas gun shop as soon as it’s available to ship, and browse more handgun barrels to keep upgrading your pistol.