The SilencerCo AC1557 ASR muzzle brake is a .458-caliber brake built for shooters who want fast suppressor changes without fumbling. Built on SilencerCo's Active Spring Retention (ASR) mounting system, this brake pairs with a growing ecosystem of SilencerCo cans—Specwar, Saker, Omega, Hybrid, and Harvester Big Bore ASR models—for one-handed attach-and-detach convenience. The 5/8"-32 TPI threads fit most .458 rifles and magnum builds, while the three-port design tackles recoil and muzzle climb whether you're running suppressed or going loud.

Even without a silencer mounted, this brake delivers meaningful recoil reduction and helps you track your shots downrange. The black nitride finish on steel stands up to the punishment of magnum rifle use and brake fouling, resisting the blast erosion that eats through softer finishes over time. Installation is straightforward—shims are included to dial in the brake's timing and run-out.

If you're building or upgrading a big-bore rifle and already own or plan to own SilencerCo ASR silencers, the AC1557 eliminates the need for different brake patterns on different rifles. One brake, multiple cans, no tools required. That's practical suppressor-host versatility.

Key Features

• Compatible with SilencerCo ASR-mounted silencers (Specwar, Saker, Omega, Hybrid, Harvester Big Bore)
• One-handed suppressor attachment and removal
• Three-port design reduces recoil and muzzle climb on unsuppressed fire
• Black nitride finish resists blast erosion and corrosion
• Includes shims for precise timing and alignment
• .46" opening accommodates various magnum and large-bore calibers

Specifications

Caliber	.458
Thread Pitch	5/8"-32 TPI
Material	Steel
Finish	Black Nitride
Mounting System	SilencerCo ASR (Active Spring Retention)
Port Configuration	3-Port
Included Accessories	Shims

Frequently Asked Questions

What SilencerCo suppressors work with the AC1557 ASR brake?

The AC1557 is compatible with any SilencerCo silencer featuring the ASR mounting system, including the Specwar, Saker, Omega, Hybrid, and Harvester Big Bore ASR models.

Can I use this brake without a suppressor attached?

Yes. The three-port muzzle brake is effective at reducing felt recoil and muzzle climb during unsuppressed fire, helping you stay on target even when shooting without a silencer.

What thread pitch does this brake have?

The AC1557 has 5/8"-32 TPI threads, suitable for .458-caliber rifles and similar large-bore magnum platforms.

Do the shims help with installation?

Yes. The included shims allow you to time the brake properly on your barrel and ensure correct alignment with your rifle's action and suppressor path.