This is a Sterling based ANH Stormtrooper E-11 Blaster with vintage Hengslter counter and a never issued M40 scope from 1943. The sterling was converted from a 9mm live fire to non-fire with Plecter Labs Blastercore v4 electronics by Alex Gordon.
(see video url below - this one is on the right)
(see video url below - this one is on the right)