a cylindrical shape concentric to the second chamber 220 and smaller in diameter such that the third chamber 230 can retract partially or wholly into the second chamber 220 the proximal end of the third chamber 230 contains an end flange or ridge 231 which extends radially outward from the cylinder body 232 and fits into the inside diameter of the second chamber 220 this end flange or ridge contacts the concentric spring 224 the distal end of the third chamber 230 has a third end cap 233 which has an opening 234 concentric with the bore and is large enough to allow the passage of the projectile from the firearm to pass through the third chamber 235 has an inner tube 235 concentric with the bore and wide enough to allow the passage of a projectile to pass through freely the inner tube 235 can be partially or fully vented with holes 236 extending radially away from the bore and allows gases to vent from the inner tube 235 to the outer section of the third chamber 230 the internal volume of the third chamber 237 can be empty or filled with sound absorbing materials or sound baffles turbulence is created by this venting of gases through sound absorbing materials or baffles allowing the associated gases more time to cool and expand thereby reducing the sound and flash signature of the host firearm the second chamber 220 with a distal second end.