Pipe lining of the barrel and silencer, 28mm wide by 447 mm long.
Valid only for:
Fx Crown cannon size 600mm
Fx Crown MKII Super ligth cannon size 500mm
Fx Wildcat MKI, MKII & MK3 cannon size 700mm
Fx Maverick Sniper Cannon size 700mm.
Metric thread 26.5:1.5 both sides.