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A muzzle device that earns its keep two ways is worth a spot in your parts drawer, and that is what KGM built with the A-TMB-S-3. On its own it is a solid steel brake that knocks down recoil on big-bore rifles, the kind wearing 3/4×24 muzzle threads. Where it really shines is as the mounting foundation for KGM's taper mount suppressors, including the R30T, R65T, and R338. Thread it on, torque it down, and your rifle is ready to accept a can with the kind of solid, repeatable lockup that taper mounts are known for.
The machined taper surface is the heart of this brake. Instead of relying on threads alone, the suppressor seats against the tapered shoulder, which wedges everything into concentric alignment every single time you mount up. That means consistent point of impact when you take the can off and put it back on, and no worrying about a suppressor slowly backing loose during a long range session. It also keeps carbon from welding the can to the mount the way straight-thread setups tend to do.
KGM machines this brake from heat-treated chromoly steel and coats it in an OXyN gas nitride finish, so it shrugs off muzzle blast, heat, and weather without complaint. The bore is cut generously enough to accept projectiles up to .338 caliber, making it a natural fit for .338 Lapua and similar magnum rifles that commonly ship with 3/4×24 threads, and it works fine for smaller bores on the same thread pitch too.
The smart way to run this system is to put an A-TMB-S-3 on every rifle you plan to suppress, then move one KGM taper mount can between them as needed. The brake stays put, the suppressor swaps in seconds, and your zero stays predictable. It is a clean, no-nonsense setup that makes owning one good suppressor feel like owning several.
This brake serves as the mounting interface for KGM's taper mount suppressor line, including the R30T, R65T, and R338. The suppressor seats against the machined taper surface for a tight, self-centering lockup. Keep in mind the brake is bored for projectiles up to .338 caliber, so match your bullet diameter accordingly.
Yes, and that is part of the appeal. The A-TMB-S-3 functions as a genuine recoil-reducing muzzle brake on its own, so your rifle is comfortable to shoot whether the can is on or off. Many folks run one on every host rifle and rotate a single suppressor between them.
The 3/4×24 pitch is common on larger magnum rifles, especially .338 Lapua and similar big-bore precision guns. The brake is bored to accept projectiles up to .338 caliber, so anything at or under that diameter on a 3/4×24 threaded barrel is fair game. Always confirm your barrel's thread spec before ordering.
KGM machines it from heat-treated chromoly steel and applies an OXyN gas nitride treatment, which hardens the surface and gives it that black finish. Nitride handles heat, muzzle blast, and corrosion far better than paint-style coatings. It is the same finishing approach used across KGM's mounting hardware for a reason.
| UPC | 784668807354 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | A-TMB-S-3 |
| Model | |
| Thread Pattern | 3/4"x24 |
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