Geissele Super Duty 16-inch on an ADM UIC Lower with Viper PST 1-6

A Geissele 16-inch Super Duty upper with its MK16 rail on an American Defense UIC ambidextrous lower, with a BCM MK2 A5-style recoil system behind it. The builder runs a Vortex Viper PST Gen II 1-6x24 in a Precision QR extended cantilever mount with a SwitchView lever, plus Magpul MBUS 3 irons. A SureFire M640DFT with a remote switch and an Exigent Defense FireTeam556 on a SilencerCo Bravo mount handle the front, with a Geissele SD-E trigger and a Magpul STR stock.