Rival Arms RA20P401E Precision 9mm Drop-In Barrel, 3.90" Gold PVD, 4340H Steel for Sig P320 Full Size

When you're chasing sub-MOA groups or running competition stages on your Sig P320 Full Size, barrel quality makes the difference between good and great. The Rival Arms RA20P401E Precision 9mm drop-in barrel pairs a match-grade design with genuine durability—no gunsmith visit required. At 3.90" in length, it's sized for full-size P320 frames and machined from 4340H steel, a material choice that pays dividends in both corrosion resistance and longevity. The gold PVD coating isn't just for looks; it creates a hard, wear-resistant surface that handles thousands of rounds while staying easy to clean.

This is a target-crowned barrel, meaning the muzzle is precisely shaped to protect the bore and support consistent accuracy round after round. Every barrel is individually hand-inspected before it ships, a small detail that matters when your match or hunt depends on reliability. The 1:10 twist with 6 groove rifling is optimized for 9mm performance, and because it's a drop-in design, you can swap it into your P320 without fitting or custom work—just remove the factory barrel and install this one.

Whether you're running drills at the range, competing in USPSA or similar matches, or simply want to wring every bit of accuracy from your P320, a quality aftermarket barrel is one of the smartest upgrades you can make. Rival Arms has built a reputation for precision manufacturing that holds up to real-world use, and this barrel carries their limited lifetime warranty to back it up.

Key Features

• Match-grade precision design for improved accuracy and shot consistency
• Drop-in installation—no gunsmith required for Sig P320 Full Size
• 4340H steel construction with superior corrosion resistance and durability
• Gold PVD hard coating resists wear and fouling buildup
• Target-crowned muzzle protects the bore and supports precision shooting
• 1:10 twist, 6 groove rifling optimized for 9mm ballistics
• Individually hand-inspected for quality assurance
• Limited lifetime warranty

Specifications

Frequently Asked Questions

Will this barrel fit my Sig P320 Full Size without gunsmithing?

Yes. The RA20P401E is a drop-in barrel designed for the P320 Full Size frame. Simply remove your factory barrel and install this one—no fitting, modifications, or professional gunsmithing needed.

What's the difference between PVD coating and standard bluing?

PVD (Physical Vapor Deposition) creates a harder, more durable surface than traditional bluing. The gold PVD finish on this barrel resists wear and corrosion better over thousands of rounds, and it's easier to keep clean during regular maintenance.

Is this barrel suitable for competition shooting?

Yes. The match-grade design, target-crowned muzzle, and precision CNC machining make this barrel well-suited for range shooting, practice, and competition use where accuracy and consistency matter.

What does "4340H steel" mean?

4340H is a high-strength, alloy steel known for excellent toughness and corrosion resistance. It's a premium choice for precision barrels because it holds tight tolerances and stands up to the stresses of firing and repeated use.