*For VFC spec V3 M4/AR15 HK416 GBB.

*Requires no modification and simple drop-in-to-use with VFC V3 M4 GBB.

*Make sure the hammer is cocked and then install the conversion kit onto the VFC V3 M4/AR15 lower receiver with the gas bolt.

*Requires the factory front set or other VFC V3 M4 GBB front set of any length.

*Easy and effortless operation of bolt action handle.

*Keep the bolt hold open functionality, press bolt release or swap a new mag to rechamber.

*Adjustable nozzle valve design, can be adjusted with M1.5 allen key.