- The NATO HUB is fully compatible with all 1.375x24TPI “HUB” compatible suppressors on the market today and is constructed of stainless-steel components. This HUB is compatible with all NATO-Spec A2 flash hiders and features a unique gate lock and ratchet system for redundant reliability and rock-solid fitment. The same suppressor attachment system is relied upon by NATO forces worldwide. The HUB version is simply threaded into compatible suppressors and snugged up with a spanner wrench. HUB assemblies can be semi-permanently attached using Rocksett or other thread locking compounds should the end user desire. Please ensure you intend to use this device on a NATO Spec Muzzle Device. Fully HUB Compatible (1.375x24TPI), Constructed of Stainless Steel,