Yankee Hill Machine sRx Short QD Muzzle Brake, 5/8x24, Black The Yankee Hill Machine sRx short muzzle brake is part of the sRx mounting system on the industry standard 1-3/8x24 HUB interface, adding minimal length and weight. An internal taper seal ahead of the threads locks it to the sRx adapter and keeps carbon off the threads. This version threads to a 5/8x24 barrel and pairs with the sRx adapter (YHM-4400). Key Features sRx QD system. 5/8x24 barrel thread. Taper seal. Cuts recoil. Made in USA. Specifications Manufacturer Yankee Hill Machine Model sRx Short Muzzle Brake, 5/8x24 Part Number YHM-4445-MB-24 UPC 841812101790 Barrel thread 5/8x24 Interface sRx, 1-3/8x24 HUB Requires YHM sRx adapter, YHM-4400 Material Steel Finish Black Made in USA FAQs What does it pair with? The YHM sRx adapter (YHM-4400). What barrel thread? 5/8x24. Why the taper seal? It locks tight and keeps carbon off the threads. Compare more muzzle devices, muzzle devices at BattleHawk Armory.