Designed with ease-of-use and durability as guiding principles, the Yankee Hill Machine sRx (Suppressor Rx) System is a sleek, low-profile, suppressor mounting system that is built to withstand rigorous use. The sRx Short Flash Hider along with the sRx Adaptor attaches to the industry standard (HUB) 1-3/8″ x 24 threads. It features an internal taper seal-in front of the threads-that locks your suppressor on and forms a tight seal to contain gasses while in-use. This means no gasses or debris can build up on the threads. The sRx Short Flash Hider adds minimal length and weight to the suppressor set up, while also allowing you to reap all the benefits of the new YHM sRx System-when used in conjunction with the sRx Adapter. (Not Included)