Flash comp vs. muzzle brake.
Both options provide a Plan B compatible mounting interface. The practical difference is what the muzzle device is designed to do when the firearm is used without a suppressor: distort visible flash or redirect gas to help reduce recoil.
The short answer.
Choose a flash comp when
You prioritize a compact, no-timing Plan B muzzle device intended to distort visible flash during unsuppressed use.
Choose a brake comp when
You prioritize gas redirection and recoil reduction during unsuppressed use and are prepared to time the device.
For suppressed use
Either still requires a compatible Plan B suppressor mount plus verified depth, bore, caliber, alignment and operating limits.
Plan B product specifications.
| Product | Threads | Caliber rating | Weight | Timing |
|---|---|---|---|---|
| Flash Comp 1/2–28 | 1/2–28 RH | Confirm barrel and projectile fit | 1.7 oz. | Not required |
| Flash Comp 5/8–24 | 5/8–24 RH | Confirm barrel and projectile fit | 1.5 oz. | Not required |
| Brake Comp 1/2–28 | 1/2–28 RH | .224 or smaller | 2.4 oz. | Required; 1/2-inch ID peel washer |
| Brake Comp 5/8–24 | 5/8–24 RH | .308 or smaller | 1.8 oz. | Required; 5/8-inch ID peel washer |
All four Plan B muzzle devices are 1.75 inches long, machined in America from 4150 CMV steel and finished with QPQ nitride. The brake comps include a peel washer for timing. The flash comps require no timing.
Peel washer sizing for brake timing.
Plan B peel washers are laminated-steel timing hardware. The 1/2-inch ID Peel Washers are sold in a six-pack and measure .506 inch ID. The 5/8-inch ID Peel Washers are sold in a four-pack and measure .631 inch ID. Both sizes measure .820 inch OD and .063 inch overall, with .002-inch peelable layers.
A peel washer provides small thickness adjustments for proper indexing. It does not change the muzzle device’s thread pitch or bore compatibility. Confirm the required washer dimensions and follow the muzzle-device manufacturer’s current installation instructions.
How the suppressor mount affects the choice.
A compatible Plan B suppressor mount engages the mounting interface on either muzzle-device style. If the suppressor uses a compatible HUB rear interface, a HUB-to-Plan-B adapter may provide that mount. However, the final decision still depends on the suppressor’s blast-chamber clearance, mount dimensions, caliber, ammunition and manufacturer approval.
A 1/2–28 or 5/8–24 Direct-Thread HUB Adapter is a different mounting path that connects a compatible HUB suppressor directly to a confirmed barrel thread. It is not used together with a Plan B muzzle device.
Frequently asked questions.
Does a muzzle brake make a firearm louder?
Redirecting gas can increase perceived blast and concussion around the shooter and nearby people. Evaluate the intended use and follow all hearing-protection guidance.
Does the Plan B Flash Comp need to be timed?
No. The Plan B Flash Comp product specifications state that timing is not required.
What does a peel washer change?
A peel washer changes the spacing used to index a compatible muzzle device. It does not change the barrel thread, muzzle-device bore or suppressor compatibility.
Can either style mount a suppressor?
Both are built around Plan B compatibility, but the exact mount, suppressor, bore, depth, caliber and alignment must be verified as a complete system.