SilencerCo® ASR 3-Port Suppressor-Ready Muzzle Brake – .30 Caliber / 7.62mm – 9/16x24 LH Left-Hand Thread Pitch – Heat-Treated Steel with Black Nitride Finish – Includes Shim Kit & Rocksett® – AC4766
Product Description
The SilencerCo® ASR 3-Port Suppressor-Ready Muzzle Brake (AC4766) represents a premier mechanical benchmark in recoil mitigation physics, small arms harmonization, and rapid NFA suppressor deployment loops, masterfully engineered and manufactured by SilencerCo in West Valley City, Utah, USA. Explicitly optimized to handle high-pressure centerfire cartridges up to .30 caliber, this specialized muzzle fixture serves a dual tactical purpose. While standard standalone muzzle breaks reduce felt blast but lock you out of running quick-detach suppressors—forcing you to constantly swap components on your workbench—the ASR layout builds a permanent, rock-solid anchor. This premium factory OEM asset (816413026762) is threaded in the specialized 9/16x24 LH (Left-Hand) pattern, engineered to directly match metric host rifle barrels, classic FN FAL variations, and custom heavy-contour precision shooting barrels.
The core structural victory of this heavy-duty muzzle engine relies on its precision CNC-machined heat-treated steel construction covered in an advanced, matte black nitride surface armor. Shifting expanding muzzle gases away from the shooter's line of sight, the advanced 3-port expansion grid captures and vents violent high-velocity propellant gases laterally. This deliberate gas redirection counterbalances natural muzzle rise, isolates cyclic jump vectors, and flattens felt linear recoil down to a highly manageable push. This gives marksmen the mechanical power to comfortably handle intense .308 Winchester, 300 AAC Blackout, or heavy 7.62mm NATO tracking sequences without losing their downrange sight picture or suffering throat-eroding alignment shift over long-term deployment schedules.
The true technical triumph of this American-built adapter lies within its seamless integration with SilencerCo's multi-patented **Active Spring Retention (ASR) quick-attach mounting ecosystem**. The exterior perimeter features precision-cut taper tracks and heavy-duty locking ridges designed to slot smoothly inside the matching female ASR mount sleeve of your suppressor. This rigid steel-to-steel interface enables true, repeatable one-handed attachment and removal. Once the collar is rotated home, the spring-loaded teeth lock down tightly to permanently stop the suppressor from rotating or backing out under aggressive high-volume strings. Accompanied by a professional-tier armorer shim kit and a capsule of high-strength Rocksett® thread-locking compound, this 3.92-ounce AC4766 muzzle break gives you total structural, geometric, and harmonic authority over your suppressed workflow.
Includes: (1) Authentic SilencerCo ASR 3-Port Muzzle Brake (.30 Caliber / 7.62mm, 9/16x24 LH Left-Hand Threading, Black Nitride Surface Finish), (1) Multi-Thickness Armorer Alignment Shim Set for Precise Timing, and (1) Single-Use Ampoule of Genuine Heat-Resistant Rocksett® Structural Adhesive, Packed inside Original Branded Factory Sealed Retail Staging Box Packaging.
*Administrative Armorer Staging, Thread Timing & Suppressor Alignment Guidance: The SilencerCo AC4766 ASR Muzzle Brake is an rock-solid mechanical muzzle module. **CRUCIAL ROTATIONAL TIMING WARNING:** This brake features a 9/16x24 LH (Left-Hand) thread pitch; to thread it onto your clean barrel shoulder, you must rotate it counter-clockwise, which is completely reverse to standard right-hand configurations. Because the gas ports must sit perfectly parallel to the horizon (at the 3 and 9 o'clock positions), utilize the included variable-thickness armorer shims to achieve precise timing orientation; **never use compressible crush washers on any suppressor mount, as crush washers deform unevenly and create extreme tolerance stacking that induces catastrophic baffle strikes**. Once timed correctly on your clean bench, degrease the threads, apply a drop of the provided heat-resistant Rocksett adhesive, and torque the brake to exactly 20-25 foot-pounds. Always explicitly verify your host rifle is fully unloaded, the magazine is extracted, and the chamber is visually clear of active cartridges before beginning installation diagnostics.
Key Features
- Active Spring Retention (ASR) Alignment: Serves as a primary host adapter for the industry-leading ASR quick-detach system, guaranteeing fast, repeatable suppressor lockdown.
- Precision 3-Port Gas Management: Optimized multi-stage expansion ports capture high-pressure muzzle blasts, heavily damping felt recoil forces and tracking climb.
- Specialized 9/16x24 LH Threading: Milled precisely in a left-hand metric hybrid pattern to directly thread onto specialized metric .30 caliber hosts and custom rifle profiles.
- Up-Armored Black Nitride Protection: High-tensile steel shell receives a premium liquid-nitride armor bath to ward off intense gas scouring, carbon baking, and rust.
- Broad Suppressor Cross-Compatibility: Natively hosts SilencerCo Omega 300, Hybrid 46, Harvester, Chimera 300, and Saker series outloaded with ASR mount caps.
- Complete Armorer Timing Package: Arrives bundled with original factory shims and rock-solid Rocksett adhesive to ensure a flat, concentric shoulder seal.
Product Specifications
- Brand: SilencerCo® (Precision engineered, machined, and live-fire endurance tested natively in West Valley City, Utah, USA)
- Product Line: ASR Suppressor Mount System & Muzzle Performance Modules
- Model Series Designation: ASR 3-Port Muzzle Brake – .30 Caliber 9/16x24 LH Edition
- SKU / MPN: AC4766 (Alternative System Identifiers: SCO-AC4766 / SIL-AC4766 / AC4766-30CAL)
- UPC Barcode Number: 816413026762
- Bore Diameter Clearance: .30 Caliber / 7.62mm Maximum Projectile Path (Accepts .300 Win Mag, .308 Win, 300 BLK, etc.)
- Muzzle Attachment Interface: 9/16x24 LH (Left-Hand Thread Configuration)
- Suppressor Lock Standard: SilencerCo ASR Taper Lock and Ridged Retention Matrix
- Chassis Monolithic Metallurgy: Hardened High-Tensile Structural Carbon Steel Billet
- Surface Protection Finishing: Chemical-Resistant Low-Reflective Matte Black Nitride Finishing
- Port Configuration Layout: 3-Port Lateral Diverter Matrix (Symmetrical Left/Right Balance)
- Device Length Dimension: ~2.42 Inches (~61.46 mm) Compact Suppressor Adapter Footprint
- Product Net Component Weight: ~3.92 oz (~0.24 lbs) Mass-Optimized Recoil Stabilizer
- Total Packaging Shipping Mass: ~0.55 lbs (Enclosed Inside Secure Protective Branded Retail Factory Storage Box)
