CYMA ABS Hop Up Chamber Set for CYMA Tokyo Marui M14 Series AEG Gearbox Rifles AirsoftCYMA ABS Hop Up Chamber Set for CYMA Tokyo Marui M14 Series AEG Gearbox Rifle. Made out of ABS. Improves Firmness of the chamber and stabilizes the muzzle velocity. Fit tightly to the barrel base to keep the chamber being centered. Suitable for CYMA Tokyo Marui M14 Series AEG Gearbox Rifle. Color Black Weight 5g Original Packing.