GPMG Gas extraction vent AFV muzzle. These are used I think and may stand corrected here for Chieftain turret guns These aide gas extraction within the turret and fit straight onto the muzzle of a barrel. As you may well know due to Health and safety flash eliminators and suppressors are now deemed to be excluded from the 68 act . It makes a change to see a little common sense come out of the Home office. Its been a long time coming.
