Yankee Hill Machine sRx Short QD Flash Hider, 5/8x24, Black The Yankee Hill Machine sRx short flash hider is part of the sRx mounting system, which threads onto 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 to a 5/8x24 barrel and pairs with the sRx adapter (YHM-4400). Key Features sRx QD system. 5/8x24 barrel thread. Taper seal. Short and light. Made in USA. Specifications Manufacturer Yankee Hill Machine Model sRx Short Flash Hider, 5/8x24 Part Number YHM-4445-24 UPC 841812101820 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.