A Com Bloc M-44, or Chinese version called a Type 53, a real fire breather in 7.63x54R.
^^^ This is it. To elaborate a bit, it's some variant of the Mosin Nagant Model 1944 carbine, the permanently-attached folding bayonet version of the Model 1938 carbine. Numerous copies were produced in other Communist countries.
Looks to be a bolt action, so not an SKS.
And if he ever decides to shoot it...it kicks like a mule!