DO NOT ORDER THIS PART UNLESS YOU ALREADY HAVE ONE OF OUR FRAME MOUNTED LOWERS.
The Underworld Arms Cyclops Upper is intended for customers who 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.
On most builds this compensator will not require recoil spring tuning.
