Features - 12 length adjustment settings. Anti-rotation and anti-thrust design stays put without sliding forward or spinning. Tube is flush with rear of SHOCKWAVE BLADE when fully collapsed. When fully adjusted out the assembly is very rigid. Strong CASTLE NUT design accepts all mil spec endplates and any aftermarket endplate. Accepts all carbine buffer systems.. TUBE ONLY, NO OTHER COMPONENTS Mfg: Kak Industry.