Description
A good muzzle device should earn its spot on your barrel, and the SilencerCo ASR Muzzle Brake does it twice over. First, it works as a legitimate three-port brake, redirecting propellant gases to knock down felt recoil and keep the muzzle flat so you can spot your own hits through the scope. Second, it serves as the host-side mount for SilencerCo's ASR (Active Spring Retention) system, which means your suppressor threads right over the brake and locks up with a quick one-hand-on, one-hand-off motion. No wrenches at the range, no fighting a stuck direct-thread can after a long string of fire.
Set Up Your .30 Cal for the ASR System
This version is cut for 5/8×24 threads, the standard pitch on most .308, 6.5 Creedmoor, and other .30 caliber bolt guns and AR-10 pattern rifles. The ASR mounting system comes standard on suppressors like the Omega 300, Chimera 300, Hybrid 46M, Omega 36M, and the Saker ASR series, and it also plays nice with the Hybrid 46, Harvester series, Octane series, and Omega K series when paired with the right ASR mount. If you run more than one rifle, grab a brake for each barrel and move a single can between them in seconds.
Built From Steel, Installed Right Out of the Box
The brake itself is machined from steel with a black finish and measures about 2.5 inches long, so it holds up to hard use without adding much weight out front. SilencerCo includes a shim set and a tube of Rocksett in the package, which takes the guesswork out of timing the ports. Shim it level, lock it down with the Rocksett, and it stays put shot after shot.
Why the SilencerCo ASR Brake Makes Sense
Even if a suppressor is somewhere down the road for you, this brake stands on its own as a recoil reducer for magnum and .30 cal rifles. And when that can does show up, your barrel is already wearing the mount. That kind of forward thinking is exactly why the ASR system has become one of the most popular quick-detach setups out there.
Key Specifications
- Manufacturer: SilencerCo
- Model: ASR Muzzle Brake
- Manufacturer Part Number: AC591
- UPC: 817272011432
- Caliber: .30 Cal / .308 / 7.62 NATO
- Thread Pattern: 5/8"-24 tpi
- Port Design: 3-Port Brake
- Material: Steel
- Finish: Black
- Length: 2.5 in
- Weight: Approx. 4 oz
- Mount Compatibility: SilencerCo ASR Mounts
What’s Included
- SilencerCo ASR Muzzle Brake (.30 Cal, 5/8×24)
- Shim set
- Rocksett thread locker
Frequently Asked Questions
Which suppressors work with the SilencerCo ASR Muzzle Brake?
The ASR mounting system comes standard on the Omega 300, Chimera 300, Hybrid 46M, Omega 36M, and Saker ASR series. It is also compatible with the Hybrid 46, Harvester series, Octane series, and Omega K series when using the appropriate ASR mount. If your can uses SilencerCo's ASR system, this brake is the host-side half of that setup.
Will the AC591 fit my 6.5 Creedmoor barrel?
Yes, as long as your muzzle is threaded 5/8×24, which is the standard pitch for most 6.5 Creedmoor, .308, and other .30 caliber barrels. The brake is bored for .30 cal projectiles, so smaller bores like 6.5mm pass through with room to spare. Just make sure your barrel threads match before ordering.
Do I need a crush washer to install the ASR Muzzle Brake?
No, and you should not use one with a suppressor mount. SilencerCo includes a shim set so you can time the ports correctly while keeping a solid, square shoulder for the suppressor to index against. Rocksett is also included to lock everything in place once it is aligned.
Does this brake reduce recoil even without a suppressor attached?
It does. The three-port design vents gases to counter recoil and muzzle climb, so it works as a standalone brake on .30 cal rifles. Many folks run it bare while they wait on a suppressor, then have the mount already in place when the can arrives.





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