KP 15 Lower, lower is 1piece much more robust than a normal ar,  Custom Upper, with Nickel Boron Bolt, .556 with a 20 inch barrel. 1in 9 twist. Has a Holosun 503 Cu Red dot . Over $900 invested in this rifle. $600 without red dot. Price is firm.Text or call nine3738zero450one, if you call leave a message if no answer.