Both uppers are fairly new. Only a few hundred rounds through them at most. I apologize I am using stock photos for them only because I’ve posted them before and did not get much interest. Both uppers are long stroke piston driven chambered in .223 Wylde. They will shoot sub moa accuracy with 1/8 barrel twist. MK116 is a 16in, the MK111 is 11.5in. I am selling way under retail because I decided a DI system would be better for my application. Will consider a trade for any decent DI 11.5in upper. Otherwise, $900 or OBO for BOTH!