You will need to choose a regulator adapter if you if you are upgrading from a standard air rig and use this adapter to replace the existing fitting on your regulator

25g Seamless Precision Grade Polished Airsoft BB's

Receiver Plastic Rail CNC Hard-Anodizing Overall Length 875mm Weight 5

RAIL LENGTH: 10 INCH KEYMOD OUTER BARREL LENGTH: 14

01mm) Tight Bore Inner Barrel

SHS Next Gen cylinder head M4 Aeg replacement ares bolt You will need to chooseDescription Material: 6061 aluminum, CNC machining High precision & high strength O ring design for better air sealing Rubber cushion to absorb shock Red color Suitable for Marui Next Gen M4 gearbox(New Ver 2)