Yankee Hill Machine sRx Short QD Flash Hider, 1/2x28, Black The Yankee Hill Machine sRx Short Flash Hider 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 1/2x28 barrel and pairs with the YHM sRx adapter. Key Features sRx QD system. 1/2x28 barrel thread. Taper seal. Flash hider. Made in USA. Specifications Manufacturer Yankee Hill Machine Model sRx Short Flash Hider, 1/2x28 Part Number YHM-4445-28 UPC 841812102700 Type Short QD flash hider Barrel thread 1/2x28 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? 1/2x28. Why the taper seal? It locks tight and keeps carbon off the threads. Compare more muzzle devices, muzzle devices at BattleHawk Armory.