Rival Arms Precision Drop-In Barrel — Sig P365 — 9mm Luger — 3.10" — Black PVD Finish — 4340H Steel — Threaded (Model RA20P002A, UPC: 788130031322)

Upgrade your Sig P365 with a competition-grade, suppressor-ready barrel that delivers improved accuracy, durability, and accessory flexibility. The Rival Arms Precision Drop-In Barrel (RA20P002A) is a true drop-in replacement engineered from 4340H steel, finished in a hard black PVD coating and cut with factory threads to accept compensators, muzzle brakes, or a suppressor (where legal). At 3.10 inches, this barrel balances a longer sight radius and improved muzzle control while maintaining the compact profile that made the P365 famous.

Engineered for Accuracy & Reliability

Rival Arms builds barrels to tight tolerances — the RA20P002A features a precision chamber, true bore, and a carefully crowned muzzle to reduce muzzle disturbance and give you tighter, more consistent groups. The 4340H material provides the toughness required for repeated firing and thermal cycling, while the PVD surface protection limits corrosion and reduces friction against the slide and locking surfaces.

Benefits you’ll notice:

• Improved groups and shot-to-shot consistency thanks to precise bore and crown work.

• Reduced muzzle rise and faster follow-ups when used with a compensator or thread-on device.

• Suppressor/compensator ready with factory threading — greater modularity for tactical, duty, or competition use.

• Durable finish & material that stands up to heavy use and range abuse.

Key Features & Specifications

• Model: RA20P002A

• UPC: 788130031322

• Caliber: 9mm Luger (9×19)

• Barrel Length: 3.10 inches

• Material: 4340H steel (high-strength alloy optimized for small arms barrels)

• Finish: Black PVD (Physical Vapor Deposition) — corrosion resistant, low-glare, wear resistant

• Threading: Factory-cut muzzle threads (verify pitch/length for accessories)

• Fitment: Drop-in for Sig P365 (standard slide; verify slide/model compatibility before purchase)

• Crown: Precision target crown for improved accuracy

• Type: Drop-in barrel — minimal or no gunsmithing required for most stock slides

(Always confirm exact thread pitch and length in product packaging or manufacturer documentation before fitting muzzle devices.)

Who This Barrel Is For

• Sig P365 owners who want suppressed or compensated shooting without permanent slide modifications.

• Competition shooters and defensive carriers who want improved muzzle control and tighter groups.

• Armorers and builders seeking a high-quality drop-in solution that reduces fitting time and produces repeatable results.

• Range users and trainers who want a durable barrel that holds up to high round counts and routine cleaning.

Drop-In Installation — Fast & User-Friendly

One of the biggest advantages of the RA20P002A is that it’s a true drop-in for standard Sig P365 slides:

1. Clear the pistol and remove the slide from the frame per Sig Sauer instructions.

2. Remove the factory barrel and replace with the Rival Arms barrel.

3. Reassemble the slide and perform a function check.

4. If you intend to mount a suppressor or threaded device, verify thread pitch and use an appropriate thread protector when the device is removed.

Pro tip: If your slide is heavily modified (optic cuts, aftermarket extractors, or non-standard tolerances), a quick check by a qualified gunsmith is recommended.

Threading, Accessories & Legal Notes

• The barrel is threaded to accept muzzle devices — check the exact thread pitch and length printed on the packaging or spec sheet for compatibility with your suppressor/compensator.

• Using a suppressor may require legal paperwork in your jurisdiction — ensure compliance with local, state, and federal laws before purchasing or attaching a suppressor.

• Use a proper thread protector when no device is installed to protect the threads and preserve accuracy.

Maintenance & Care

• Cleaning: Clean the bore and chamber after each range session. Use non-abrasive bronze brushes and quality solvents.

• Finish Care: PVD is robust, but avoid harsh abrasives; wipe the exterior with a microfiber cloth and protect from prolonged saltwater exposure.

• Inspection: Periodically check the crown and threads for nicks or damage; replace or re-crown if accuracy degrades.

• Lubrication: Light lube on moving/contact surfaces helps reduce wear but keep the bore and feed ramps free of heavy oil.

Compatibility & Fitment Reminder

• Designed for the standard Sig P365 slide and factory parts. Do not assume fitment for other Sig models (P365XL, P365X, or heavily modified slides) without verification. If you own a variant or an aftermarket slide, confirm dimensions and extractor timing before installation. When in doubt, consult a qualified gunsmith.

Why Rival Arms?

Rival Arms focuses on practical, match-grade upgrades that provide measurable improvements in accuracy and functionality without requiring complex gunsmithing. The RA20P002A combines high-strength 4340H steel, precise machining, and a protective PVD finish to deliver a threaded, drop-in barrel that enhances the capability of your compact Sig P365 platform.

Technical Snapshot (Quick Reference)

• Model: RA20P002A

• UPC: 788130031322

• Caliber: 9mm Luger

• Length: 3.10"

• Material: 4340H steel

• Finish: Black PVD

• Threaded: Yes — factory-cut threads (verify pitch/length)

• Fitment: Drop-in for Sig P365 (verify slide variant)

• Use Cases: Competition, duty, suppressed/compensated builds, range/training

Final Thoughts

If you want to take your Sig P365 beyond factory performance — whether for improved accuracy, better muzzle control, or the ability to mount threaded muzzle devices — the Rival Arms Precision Drop-In Barrel (RA20P002A) is a high-value upgrade. It installs quickly, is built from strong 4340H steel, sports a durable black PVD finish, and gives you the modularity to adapt your compact pistol to modern defensive and competitive roles.

The End