Bolt Carrier Guide Bushing, V2, Fusion Engine Poppet Valves Most stock hop up units

Most stock hop up units have loose fitment in the outer barrel

Dent in Cylinder

With the Red Low Flow poppet installed along with one of these higher flow nozzles

• Quarter-turned to avoid crease down the middle

Bolt Carrier Guide Bushing, V2, Fusion Engine Poppet Valves Most stock hop up unitsThe V2 Fusion Engine will come with Bolt Carrier Guide Bushing attached to the top of the front cylinder section. It is mainly used to prevent the mock bolt carrier from impacting the hop up adjustment wheel on certain models of M4's. This is an OEM replacement in the event yours gets taken by the workbench gremlins. The 8 32 screw which secures the bushing to the cylinder comes as part of the Fusion Engine Screw Set.