LMT Defense 4 Port Regulator Brake 5.56 1/2"x28 Threads (Dead Air Xeno Compatible) - SKU: R-RMB1228556 - UPC: 850076573171
Product Description
The LMT (Lewis Machine & Tool) R-RMB1228556 4-Port Regulator Muzzle Brake is an ultra-durable recoil and muzzle-climb reduction device engineered for 5.56mm / .223 caliber rifles with 1/2"x28 thread profiles. Featuring four side-venting porting chambers, this muzzle brake redirects expanding high-pressure propellant gases laterally to virtually eliminate muzzle rise and keep the sights flat on target during rapid follow-up engagements.
Designed to serve as a fast QD interface for Dead Air's Xeno Mount suppressor system, the Regulator series utilizes left-handed mounting threads. This inverse thread geometry eliminates the risk of accidentally backing the muzzle brake off the barrel shoulder when detaching your suppressor after heavy firing schedules.
Precision CNC-machined from high-strength alloy steel and coated with a durable, heat-resistant black finish, the LMT R-RMB1228556 also acts as an effective sacrificial blast baffle inside the suppressor's expansion chamber, significantly extending the service life of internal suppressor baffles on hard-use AR-15 carbines and precision rifles.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits barrels chambered in 5.56mm NATO / .223 Remington or smaller with standard 1/2"-28 thread pitch. Compatible with Dead Air Xeno Omni/Adapter suppressor mounts.
- Verify host firearm is completely clear, magazine removed, and chamber visually and physically confirmed empty.
- Clean barrel muzzle threads thoroughly to remove carbon fouling, dirt, and old threadlocker residue.
- Apply proper timing shims to correctly index the brake ports horizontally, along with high-temperature threadlocker (such as Rocksett).
- Thread the R-RMB1228556 muzzle brake onto the barrel shoulder by hand to prevent cross-threading.
- Torque the muzzle device to 25–30 ft-lbs using an appropriate armorers wrench on the precision wrench flats, and verify bore clearance with an alignment rod prior to live-fire.
Key Features
- 4-Port Concussive Recoil Reduction: Lateral ports vent gases sideways to eliminate muzzle rise and maintain sight alignment.
- Dead Air Xeno Compatibility: Interfaces directly with Dead Air Xeno Omni/Adapter suppressor mounts for fast QD attachment.
- Left-Handed Xeno Threads: Prevents accidental unthreading of the muzzle device from the barrel during suppressor removal.
- Sacrificial Baffle Action: Protects primary silencer baffles from premature erosion under high-volume firing schedules.
- 1/2"x28 Thread Pitch: Standard mounting thread pattern for 5.56 NATO / .223 Rem rifle barrels.
- Heat-Resistant Black Coating: Shielded against chemical solvents, extreme heat, and atmospheric corrosion.
Product Specifications
- Brand: LMT Defense (Lewis Machine & Tool)
- MPN: R-RMB1228556
- UPC: 850076573171
- Caliber Rating: 5.56mm NATO / .223 Rem
- Thread Pitch: 1/2"-28 TPI
- Mount Compatibility: Dead Air Xeno System
- Muzzle Style: 4-Port Muzzle Brake
- Material: High-Grade Steel Alloy
- Finish: Heat-Resistant Black Coating
