FERFRANS M4 UPPER RECEIVER GROUP ENHANCED

The FERFRANS M4 URGE is an M4A1 compatible complete upper receiver group using a short-stroke adjustable piston system with a rate reduction system for controlled rate of full auto fire. It is also capable of firing high capacity magazine.

The FERFRANS M4 URGE is interoperable with the M4A1 lower receiver that utilizes a 2 pin system attachment method. NOTE: Only use mil-spec lower receiver and parts to function reliably.