Fast-Attach To The Finest Muzzle Devices. The SureFire Fast-Attach Hub suppressor mount allows easy conversion of 1 3/8-24 thread-pattern HUB suppressors and accessories to QD for use with SureFire SOCOM Fast-Attach muzzle devices, so users can enjoy the benefits of the Fast-Attach mounting system. It is the only HUB suppressor mount on the market that mimics the SureFire SOCOM suppressor-adapter interface. Surefire's patented Fast-Attach design provides rock-solid attachment of a Fast-Attach Hub-equipped suppressor or accessory to SOCOM muzzle devices in seconds without requiring any tools. Simply slide the Hub over the SureFire muzzle adapter, indexing on the built-in slot, and secure the lock ring at the base. The Fast-Attach Hub is precision-machined with the same dimensions and tolerances as our combat-proven suppressor back section to ensure the proper fit with SOCOM muzzle devices. It is manufactured of stainless steel in the U.S.A. and black nitride-coated for unmatched durability and long service life. The Fast-Attach Hub is not an NFA device and is available wherever SureFire products are sold, without any of the restrictions associated with suppressors. It is the best option if you plan to run a HUB suppressor on your Surefire SOCOM muzzle device.