Multiple inserts are available to make your Wolverine one of the most versatile silencers you own. The smaller threads will use the M14 Collar, M24 thread will use the M24 collar, and the M26 thread will use the M26 collar. Note: Bulgarian Krinkov/SBRs take the 24mm LONG Insert. Dead Air Silencers Dead Air .30 Cal Wolverine Thread Insert 26mm LH PAP92 w/M26Collar WV202