The Nuprol M4 Cylinder Head is a precision‑made internal gearbox component designed to replace or upgrade the stock Version 2 AEG cylinder head in M4‑style airsoft rifles. It plays a key role in your rifle’s air compression system, helping to deliver consistent power and efficiency shot after shot. 
 
Product Overview
This cylinder head is crafted from CNC aluminium with a double O‑ring seal for enhanced air compression. By improving the seal between the gearbox cylinder and the head, it helps reduce lost air during firing — which can contribute to more consistent muzzle velocity and smoother performance in your M4 platform rifle.
 
Key Features
CNC Machined Aluminium Construction: Durable and lightweight aluminium body designed for long‑lasting use in high‑stress gearbox environments.
Double O‑Ring Seal: Dual rubber O‑rings create a tighter air seal between the cylinder and head, improving compression and efficiency.
Enhanced Air Efficiency: Better sealing can help your gearbox generate more consistent air pressure, which can improve shot‑to‑shot consistency and overall performance.
Direct Replacement Fit: Designed to fit most standard Version 2 gearbox setups used in M4/AR‑15 style AEGs — perfect for maintenance or performance care.
Red Anodised Finish: Attractive, corrosion‑resistant finish that clearly identifies the upgraded component.