Yes,I've fired it quite a few times.(with WWII vintage ammo- zero misfires) The recoil is substantial: more than a .45,but less than a full load .44 magnum. It is indeed .30 cal. carbine. The rounds are staggered ,so the integral magazine doesn't even extend into the butt.
I'm not sure of the weight,but it's quite heavy and about 34cm long.
The grips are translucent and I think that bakelite is opaque. I remember my Dad saying that he used this material because it was unusual at the time and so easy to work with. His .45 has grips made from the same stuff.
He was a captain in a mobile Ordnance Maintenance outfit, so he had access to a nice machine shop and plenty of toys.