DO NOT ORDER THIS PART UNLESS YOU ALREADY HAVE ONE OF OUR FRAME MOUNTED LOWERS.
The Underworld Arms Cerberus Upper is intended for customers who have a Gen 3 MAC with full length frame and windowed slide and already own one of our frame mounted compensators and want to swap to this new style upper.
This compensator upper features a large expansion chamber with a narrow thru hole and large baffle wall which redirects the gas through a single top port to efficiently reduce muzzle flip.
