BCM 14.5-inch Raider Carbine on a PSA Sabre Lower with HUXWRX Flow 556K

A BCM 14.5-inch upper with the RAIDER-M13 rail, pinned and welded to a HUXWRX muzzle device to reach 16 inches, on a PSA Sabre-15 lower. The builder's first can is a HUXWRX Flow 556K, which they report runs quietly with no gas to the face on a JP Silent Captured Spring and H1 buffer. An EOTech EXPS2 on a Unity riser, Magpul MBUS Pro irons, a Holosun Raid light and a Geissele SD-E trigger round it out, with a Magpul STR stock.