I have a DPMS lower with a PA-10 upper. 16" barrel with lightweight forearm. Rifle is new zero rounds through it. I will be sighting in the scope in the near future if it doesn't sell before I get around to it. Has burris pepr QD scope mount, and a vortex crossfire II 4-12x50 dead hold BDC rifle scope. The pepr mount also has smoth or picatinney scope caps which allows you to mount a red dot right above the scope. Let me know if you have any questions. Kenan 707four9nine00one3