It is done:
Daniel Defense URX4 16" Rifle
DyTac 14.5" URX4, VegaForceCompany Daniel Defense Vickers Receiver and KAC 16" SR15 E3 barrel, HSP Thorntail Keymod light mount with HSP Inforce WML, Magpul MBUS Pro sights and various digi-camo-dipped Magpul furniture. Finished with a Primary Weapon Systems TTO muzzle brake.
Inside is a upgraded VFC mechbox with a Gate PicoSSR milspec wired to a Lonex A1 motor. Barrel group is a Lonex M4/M16 hop-up unit, Prometheus bridge-hop tensioner and Lonex 433mm steel 6.03 tightbore barrel.