Siege Brake .223/5.56 (SB3-5.56)


Availability: In stock

For only 223/5.56 or 300 blackout ONLY AR15 platform.
*HIGHLY recommend adjustable gas block. Overgassed systems will mitigate performance benefits.*
  • Slightly slimmer and lighter than our UB brake
  • Uses an internal expansion chamber to reduce recoil and maximize tunability
  • Tunable via drilling dimples at expansion chamber (instructions provided)
  • Simplified design is perfect for all builds
  • Drastically reduces recoil and also functions as a compensator
  • For .223/5.56mm or 5.45mm caliber rifles with 1/2″-28 barrel threads
  • Includes crush washer
  • Makes 16″ overall length on 13.7″ or longer barrels (possibly 13.5″ but depends on barrel thread length)
  • 3.100″ Overall length with the actual length after muzzle crown being ~2.600″ (legal for most competition divisions)
  • .894″ Diameter at widest point
  • 3.2oz Weight
  • No frills design without threaded adjustment ports is less costly to manufacture so we pass the savings along to the end user
  • Brakes are bead blasted then go through QPQ Black Nitride giving them a slightly matte black finish
  • 100% made in the USA like all of our products

Our UB brake is still slightly more effective but the Siege brake is a great option for general use on non “gamer gun” builds or even for the serious competition shooter who prefers a lighter muzzle device and/or doesn’t want to mess with the adjustments of the UB brake.

Weight.25 lbs
Dimensions1 × 1 × 4 in


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Unrivaled Pro Shop Siege Brake, ar-15 muzzle brake, ak muzzle brake, Ar-10 muzzle brakeUnrivaled Pro Shop Siege Brake, ar-15 muzzle brake, ak muzzle brake, Ar-10 muzzle brakeSiege Brake .223/5.56 (SB3-5.56)

Availability: In stock

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