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SilencerCo ASR Muzzle Brake 5.56MM Fits Specwar Saker Hybrid Omega Harvester ASR Mounting System 1/2x28 AC142 UPC 817272010336
Product Description
The SilencerCo ASR Muzzle Brake 5.56mm (AC142) is a high-performance muzzle device and suppressor mounting platform designed for AR-15 rifles and 5.56 NATO / .223 Remington carbines. Threaded in standard 1/2x28 TPI, this dual-port muzzle brake effectively tames felt recoil and muzzle rise during fast unsuppressed firing strings, allowing shooters to maintain target sight picture and perform rapid follow-up shots with confidence.
In addition to its standalone recoil mitigation capabilities, the AC142 features SilencerCo's patented Active Spring Retention (ASR) quick-detach interface. The external threading and taper geometry provide a rigid, repeatable lockup when mounting ASR-compatible silencers—including the Omega 300, Hybrid 46, Saker ASR, Specwar, and Harvester EVO. The taper mount seals off carbon blowback from reaching the attachment threads, ensuring smooth, non-binding suppressor detachment even after high-volume firing sessions.
Precision-machined in the USA from high-strength stainless steel and treated with a durable Black Nitride finish, the AC142 is built to resist thermal erosion, carbon pitting, and chemical wear. Included with a shim set for precise timing alignment during installation, the SilencerCo 1/2x28 ASR Muzzle Brake is an essential mounting upgrade for tactical shooters, law enforcement officers, and suppressed rifle enthusiasts.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits rifle barrels chambered in 5.56mm NATO / .223 Rem (and smaller calibers) with 1/2x28 TPI threads. Interfaces directly with SilencerCo ASR Mounting System silencers (Omega 300, Saker series, Hybrid 46, Specwar, Harvester ASR) and third-party suppressors fitted with an ASR mount module.
- Perform a complete firearm safety check: drop the magazine, lock the bolt rearward, and visually inspect the chamber to verify zero live rounds are present.
- Clean the barrel muzzle threads (1/2x28) completely using a copper wire brush and solvent to remove old threadlocker, carbon, or grease.
- Select the correct combination of included alignment shims to achieve proper timing so the side brake ports orient horizontally at the 3 o'clock and 9 o'clock positions.
- Apply a small drop of high-temperature threadlocker (Rocksett recommended for suppressed use) to the clean barrel threads.
- Thread the AC142 brake onto the barrel by hand and torque to 20–30 ft-lbs using a standard armorer's wrench.
- Allow threadlocker to cure for 24 hours before mounting your ASR suppressor and verifying bore alignment with a caliber-specific alignment rod.
Key Features
- Dual-Port Recoil Mitigation: Port geometry redirects expanding combustion gases laterally to reduce felt recoil and muzzle jump.
- ASR Quick-Detach Interface: Provides fast, secure mounting for all SilencerCo Active Spring Retention silencers and modules.
- High-Strength Stainless Steel Construction: Machined to exacting tolerances to withstand extreme operational heat and muzzle blast.
- Durable Black Nitride Finish: Slick protective coating protects internal expansion chambers and threads from carbon buildup and corrosion.
- Precision Sealing Taper: Seals carbon away from mounting threads to prevent suppressor seizure during high-round-count sessions.
- Includes Timing Shim Pack: Comes complete with a multi-thickness shim set for accurate port alignment on standard 1/2x28 barrel shoulders.
Product Specifications
- Brand: SilencerCo
- Model/Series: ASR Muzzle Brake (5.56mm)
- MPN / SKU: AC142
- UPC: 817272010336
- Caliber Fitment: 5.56mm NATO / .223 Rem
- Thread Pitch: 1/2x28 TPI
- Mounting System: SilencerCo ASR (Active Spring Retention)
- Material: Stainless Steel
- Finish / Color: Black Nitride
- Weight: 3.9 oz
- Country of Origin: USA
