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The LMT 4-Port Regulator Brake is one of those parts that pulls double duty on a 5.56 build. On its own, the aggressive four-port geometry vents gas hard to the sides to flatten out muzzle rise and keep your sights settled shot to shot. Thread it onto a 1/2×28 barrel and you've got a serious recoil-fighting brake, but the real trick is that it also serves as the mounting interface for LMT-AT's suppressor ecosystem.
LMT machined this brake from 17-4 stainless steel alloy and finished it in black nitride, so it holds up to heat and stays corrosion-resistant round after round. The bore runs 0.300 inch on the 1/2×28 version, keeping projectile clearance tight for consistency. That four-port cut is built for maximum recoil reduction, which is why it's the pick for competition guns and high-round-count setups where a fast return to zero matters more than muzzle blast.
This is where the Regulator system earns its keep. The brake works as a direct mount for LMT rifle cans like the ION 30, ION LT, and ION K, and because it uses the industry HUB and Xeno pattern, it also plays nice with Dead Air Xeno-mounted suppressors and other third-party 1/2×28 mounts. Leave the can off for range days, then click it on when you want to run quiet, no barrel swap needed.
The internal 1/2×28 thread mounts it to a standard 5.56 barrel, while the external threading matches up with the Xeno/HUB base mount adaptor. It performs well as a standalone brake, but if you're building around an LMT-AT suppressor, pairing it with the HUB Base Mount Adaptor is where it really shines. Plenty of tooling surface makes install and removal straightforward, which is handy if you leave a suppressor mounted for thousands of rounds and need extra torque to break it loose later.
It's built to mount LMT rifle suppressors including the ION 30, ION LT, and ION K. Because it uses the HUB and Xeno pattern, it also works with Dead Air Xeno-mounted suppressors and other compatible third-party 1/2×28 mounts. That gives you a lot of flexibility if you're running cans across multiple hosts.
Absolutely. The four-port design works great as a standalone brake, venting gas to the sides to cut recoil and keep the muzzle flat for faster follow-up shots. Pairing it with the LMT-AT HUB Base Mount Adaptor is where it really opens up as part of a suppressor setup, but you don't need a can to get the recoil benefits.
This version has a 1/2×28 internal thread, which is the standard pitch for most 5.56 and .223 barrels. The bore runs 0.300 inch to match that caliber. Just confirm your barrel is threaded 1/2×28 before ordering.
The four-port design is tuned for maximum recoil reduction, making it the choice for competition rigs and high-recoil setups where a quick return to zero matters most. The single port version leans toward balanced control and a bit less concussion. Both share the same HUB and Xeno mounting compatibility.
| UPC | 850076573171 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | R-RMB1228556 |
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