Yankee Hill Machine sRx Short QD Muzzle Brake, 5/8x32, Black The Yankee Hill Machine sRx Short Muzzle Brake is part of the sRx mounting system, which uses the industry standard 1-3/8x24 HUB interface. An internal taper seal ahead of the threads locks it to the sRx adapter and keeps carbon off the threads. This version threads onto a 5/8x32 barrel and pairs with the YHM sRx adapter. Key Features sRx QD system. 5/8x32 barrel thread. Taper seal. Muzzle brake. Made in USA. Specifications Manufacturer Yankee Hill Machine Model sRx Short Muzzle Brake, 5/8x32 Part Number YHM-4445-MB-32 UPC 841812101806 Type Short QD muzzle brake Barrel thread 5/8x32 Interface sRx, 1-3/8x24 HUB Requires YHM sRx adapter Finish Black Made in USA FAQs What does it pair with? The YHM sRx adapter. What barrel thread? 5/8x32. Why the taper seal? It locks tight and keeps carbon off the threads. Compare more muzzle devices, muzzle devices at BattleHawk Armory.