Madbull M4 CQB 7-Inch Outer Barrel Gears and Motors We will offer a flow

We will offer a flow reducing option in the future for the engine to reduce the output energy and allow higher operating pressure for longer barrel builds

Each gear has a unique PROMETHEUS brand Logo

bright colors serve as a clear indicator to differentiate training magazines from live ammo

Furthermore CO2 magazines cannot be stored with a live capsule

Madbull M4 CQB 7-Inch Outer Barrel Gears and Motors We will offer a flow~1cm length adjustable. Fits most M4 AEG receivers in the market. 2" screws to lock the adjustable parts. This barrel is for extreme short CQB setups, features front sight pin groovesGreat if you want to really shorten your M4 for CQB! Note: the entire barrel including chamber section is 7" long.