Yankee Hill Machine Q.D. Thread Protector. D. flash hiders and mounts from becoming dirty or damaged when your suppressor is not in use. Does not fit the .338 Q.D. mounts. Specifications for Yankee Hill Machine Q.D. Thread Protector YHM-3114: Mfg Item Num: YHM-3114 Type: SILENCER_MOUNTS/ACCESSORIES made in specialized factories: made in specialized factories Tactica: Tactical Master Model Header: Q.D. Thread Protector The Yankee Hill Machine Q.D. Thread Protector YHM-3114 is a quality addition to the Yankee Hill Machine lineup. For more great deals on Muzzle Devices by Yankee Hill Machine please browse our Yankee Hill Machine Gun Parts page. Yankee Hill Machine Q.D. Thread Protector