SILENCERCO AC857 ASR MUZZLE BRAKE 5/8X24 .338 CAL

SilencerCo engineers the ASR Muzzle Brake (AC857) as a suppressor-ready 3-port muzzle brake purpose-built for .338 caliber rifles with 5/8x24 barrel threads, giving serious long-range shooters and big-bore hunters a standalone brake that also serves as the host interface for any SilencerCo suppressor equipped with a compatible ASR Mount. If you have been searching for a .338 caliber muzzle brake compatible with the SilencerCo ASR suppressor mounting system, the AC857 is the direct factory solution for that configuration.

Key Features

• Part number: AC857
• Caliber compatibility: .338 caliber
• Thread pitch: 5/8x24
• Design: 3-port muzzle brake
• Material: Steel
• Finish: Black nitride
• ASR Mount compatibility: Alpha, Bravo, and Charlie class ASR Mounts
• Includes: Shim set and Rocksett high-temperature threadlocker
• Installation torque: 20 to 30 ft-lbs

Special Features

• The ASR system uses an Active Spring Retention mechanism built into the suppressor mount, which threads over the installed brake and locks into position with a spring-loaded cam that holds the suppressor securely against vibration and cannot loosen during sustained fire
• The three-port design vents propellant gas upward and laterally at the muzzle, countering the rotational lift that .338 Magnum and large-bore cartridges generate during firing and keeping the muzzle in a flatter position through each shot cycle
• The black nitride finish is applied through a thermochemical diffusion process that hardens the steel surface and bonds corrosion resistance directly into the material rather than sitting on top of it as a coating layer, which means the finish does not chip, peel, or wear through at contact points
• The included shim set allows the shooter to time the brake precisely so the ports face the correct lateral orientation when the brake seats fully against the barrel shoulder, without gaps or over-torque
• Rocksett high-temperature threadlocker ships with the brake and is the manufacturer-specified compound for installation, rated for the heat cycles and torque loads that muzzle devices on high-volume .338 platforms experience over extended range use
• The ASR interface is fully compatible across SilencerCo's current suppressor lineup that uses ASR Mount sizing, including the Omega 300, Hybrid 46, and Velos series, giving the shooter a single installed brake that works as a transfer point for multiple suppressor options

Practical Benefits

• Installing the AC857 on your .338 rifle gives you a fully functional standalone muzzle brake for unsuppressed use that converts to a suppressor host the moment you thread an ASR-equipped suppressor over it, eliminating the need to swap muzzle devices when transitioning between suppressed and unsuppressed configurations
• The one-hand-on, one-hand-off suppressor attachment and detachment that the ASR cam lock delivers means your suppressor goes on and comes off in seconds at the range or in the field without tools
• The 5/8x24 thread pitch covers a broad range of factory and custom .338 caliber rifles including common .338 Lapua Magnum, .338 Winchester Magnum, and .338 Federal platforms, making this brake a direct fit across multiple rifle systems without adapters
• The included shim set and Rocksett remove the need for a separate hardware run before installation, which means you have everything required to mount and time the brake correctly the day it arrives
• If you already run a SilencerCo ASR-compatible suppressor on another caliber rifle, adding the AC857 to your .338 platform standardizes your mounting system across multiple rifles and eliminates the learning curve of a second attachment method

The SilencerCo ASR Muzzle Brake (AC857) in .338 caliber with 5/8x24 threading is a smart addition for the long-range shooter or big-bore hunter who wants a high-performance standalone brake today and a direct suppressor interface ready when the time comes.