Grey Ghost Precision Barrel Sig P320 Full Size 9mm Luger Stainless Steel Nitride

The Grey Ghost Precision stainless steel nitride barrel for Sig P320 Full Size 9mm is a match-grade drop-in replacement built for shooters who demand accuracy and reliability without compromise. Grey Ghost Precision draws on deep military and manufacturing expertise to produce components that meet three core standards: they have to be accurate, reliable, and attainable. This barrel delivers on all three—it's precision-engineered to improve your P320's performance out of the box, whether you're training at the range, competing, or carrying for duty.

Machined from 416R stainless steel to match-grade tolerances, this barrel is finished with nitride hardening for corrosion resistance and durability. The final dimensions hold to ±0.003", ensuring consistency shot to shot. It's chambered to SAAMI specification for 9mm Luger and features a 1:10 twist rate optimized for standard and modern 9mm loads. Because it's a true drop-in design for the Sig P320 Full Size frame, installation is straightforward—no gunsmithing required.

If you've noticed your P320 could shoot tighter groups, or you want to refresh the barrel as preventive maintenance on a heavily used duty or competition gun, this is the kind of upgrade that pays dividends in every shot. Grey Ghost Precision's reputation in the shooting sports community is built on this exact formula: solid engineering, reasonable cost, zero marketing fluff.

Key Features

• 416R stainless steel match-grade construction for superior accuracy and longevity
• Nitride finish resists corrosion and wear
• Final dimension tolerance of ±0.003" for consistent, reliable performance
• Drop-in design for Sig P320 Full Size—no modifications needed
• SAAMI-spec 9mm Luger chamber with 1:10 twist rate

Specifications

Frequently Asked Questions

Will this barrel work in my Sig P320 Full Size?

Yes. This is a drop-in barrel designed specifically for the Sig P320 Full Size frame. No modifications or gunsmithing are required.

What makes 416R stainless steel better for a barrel?

416R is a premium stainless steel known for its strength, machinability to tight tolerances, and corrosion resistance. Match-grade barrels are held to exacting standards (in this case, ±0.003") to maximize accuracy and consistency.

Is the nitride finish important?

Yes. The nitride hardening process strengthens the barrel's surface, improving resistance to corrosion and wear—critical for barrels exposed to moisture, frequent cleaning, or high round counts.

What ammunition should I use?

This barrel is SAAMI-spec chambered for 9mm Luger and accepts standard and modern 9mm loads that meet SAAMI specifications. Always verify your ammunition matches the chamber marking on the barrel.