Dead Air Armament Wolverine PBS-1 Thread Insert 15mm RH HK. The smaller threads will use the M14 Collar M24 thread will use the M24 collar and the M26 thread will use the M26 collar. Specifications for Dead Air Armament Wolverine PBS-1 Thread Insert: Manufacturer: Dead Air Silencers Color: Black Package Contents: Dead Air Armament Wolverine PBS-1 Thread Insert Dead Air Armament WV203: Wolverine PBS-1 Thread Insert 15mm RH HK