device apply great pressure to the bottom of cylindrical locking plug 32 pressing it with tremendous force against threads 21 of locking cam nut 20 thus preventing locking cam nut 20 from loosening on collet 30 collet segments 33 separated by slits 26 are heat treated to form springs which resiliently press against the inside of locking nut 20 and threads 21 to prevent locking nut 20 from separating and becoming lost in the field from said device 10 a stop collar 37 is machined on collet 30 as shown in fig2 and fig3 to limit the advance of sound suppressor tube not shown collet threads 36 are utilized to attach a sound suppressor tube but can be adapted to attach other auxilliary equipment such as a grenade launcher all parts described herein are generally tubular and machined from bar stock steel of the grade commonly used for manufacturing weapons the steel has to withstand the high temperature heat generated by burning or exploding gunpowder passing through the device a gas tube 38 for transmitting gun powder gas is shown in fig3 and is machined to a close tolerance that will permit a tight press fit within collet bore 28 the gas tube has a small section 38 and has a mid section 39 of larger diameter an end section 41 is of slightly larger diameter than mid section 39 to provide a shoulder to contact collet bore stop shown at 27 this permits properly locating the machined gas tube in axial alligment with the gun when press fitted within collet 30 in a position to transmit gun powder gases through the device to an attached sound suppressor and.