SilencerCo Sig Sauer P226 Threaded Barrel 1/2x28 - AC859

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SilencerCo AC859 Sig P226 Threaded Barrel 5" 9mm Luger Black Nitride Stainless Steel AC859 UPC 817272012057

Product Description

The SilencerCo Sig P226 Threaded Barrel (AC859) is a premium match-grade, drop-in replacement barrel engineered specifically for Sig Sauer P226 9mm handguns. Designed to provide a seamless suppressor attachment platform, this 5.0-inch barrel features standard 1/2x28 tpi right-hand muzzle threads, making it compatible with a vast array of 9mm silencers, muzzle brakes, and compensators.

Precision CNC-machined from 416R stainless steel, the AC859 offers exceptional mechanical strength and inherent benchrest accuracy. Finished in a slick, ultra-durable Black Nitride QPQ treatment, the barrel surface provides supreme wear resistance, low friction during slide cycling, and maximum corrosion protection against moisture, sweat, and carbon erosion.

Complete with an included matching thread protector to guard thread crowns when shooting unsuppressed, the SilencerCo Sig P226 Threaded Barrel represents the gold standard for suppressed pistol staging, competition setups, and tactical upgrades.

Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard factory Sig Sauer P226 9mm handguns. (Not compatible with P226 X-Five models or P229/P220 frames).

1. Perform a complete firearm safety check: drop the magazine, lock the slide rearward, and visually inspect the chamber to verify zero live rounds are present.
2. Field strip the Sig P226 slide assembly by locking the slide, rotating the takedown lever, and removing the slide, recoil spring assembly, and factory barrel.
3. Clean factory packing oil or debris from the SilencerCo AC859 barrel feed ramp and chamber interior.
4. Insert the SilencerCo barrel into the slide housing, ensuring the barrel hood drops securely into the ejection port.
5. Reinstall recoil spring and guide rod, assemble slide onto lower receiver, and perform hand safety/function checks.
6. When attaching a suppressor, ensure the piston (booster) features matching 1/2x28 threads and apply a light dab of anti-seize compound to barrel threads prior to mounting.

Key Features

• Match-Grade Precision: Precision-machined from 416R stainless steel to provide match-grade lockup and enhanced accuracy.
• 1/2x28 Thread Pitch Standard: Industry-standard US thread spec for universal compatibility with 9mm suppressors and muzzle devices.
• Black Nitride QPQ Finish: Ferritic nitrocarburized surface treatment delivers extreme corrosion resistance and low friction.
• 5.0" Extended Length: Extends past the front of standard P226 slides to provide adequate clearance for suppressor piston housings.
• Included Thread Protector: Comes complete with a knurled steel thread protector to shield thread geometry when unsuppressed.
• Drop-In Installation: Direct factory drop-in fitment requiring no custom fitting or gunsmith modification.
• Made in the USA: Proudly manufactured in the United States backed by SilencerCo's legendary quality assurance.

Product Specifications

• Brand: SilencerCo
• Model/Series: Sig Sauer P226 Threaded Replacement Barrel
• MPN / SKU: AC859
• UPC: 817272012057
• Caliber: 9mm NATO / 9x19mm Luger
• Barrel Length: 5.0 in
• Thread Pitch: 1/2x28 tpi
• Platform Compatibility: Sig Sauer P226 (9mm)
• Material: 416R Stainless Steel
• Finish / Color: Black Nitride
• Twist Rate: 1:10" RH
• Weight: 4.1 oz
• Country of Origin: USA