Dead Air Silencers Wolverine Insert 14mm RH. The smaller threads will use the M14 Collar M24 thread will use the M24 collar and the M26 thread will use the M26 collar. Bulgarian Krinkov/SBRs take the 24mm LONG InsertSpecial notePolish WZ88 "Tantal" rifles have a unique barrel/thread profile that we do not accommodate currently. The muzzle extends well past the threads and that does not work with our system. They cannot be cut to thread length without being an SBR. It's an issue we may address at some point but for now the Wolverine cannot mount to them. Specifications for Dead Air Silencers Wolverine Insert: Manufacturer: Dead Air Silencers Color: Black Threads per Inch: 14x1 LH Features of Dead Air Armament Dead Air Wolverine Thread Insert - 14mm RH: Versatile silencers Smaller threads M14 Collar M24 thread M24 collar M26 thread M26 collar Package Contents: Dead Air Armament Dead Air Wolverine Thread Insert - 14mm RH Dead Air Silencers WV204: Wolverine Insert 14mm RH