Rocket Airsoft Pro-1 M4 Metal Hopup Chamber 6mm (0.23-0.66g) It literally fits most airsoft

It literally fits most airsoft guns

clone guns

so no heavy modification is needed to change its stock

Battery and charger not included

and a 14mm threaded outer barrel for muzzle brakes

Rocket Airsoft Pro-1 M4 Metal Hopup Chamber 6mm (0.23-0.66g) It literally fits most airsoftThe Rocket Airsoft Pro 1 M4 Metal Hopup Chamber is an advanced design similar to the Prowin, but with a different cut and some extra parts included. Clean and aluminum make will fit in all M4 AEG airsoft guns' gearboxes. Includes SHS rubber bucking, but we recommend another bucking, such as a Maple Leaf, sold separately. Great for HPA gun installs! Packaging is Rocket Airsoft (OEM SHS).