I'll bet it's a fun ride.
I put together the 'weak sister'. It's a PSA 10.5" 7.62x39 upper. Cheap to feed, runs like a champ with enhanced firing pin, C-Products 28-round Duramags, and steel cased Russian fodder. 124gr does around 2150 fps.
Loads of fun to shoot, up close, and plinking out to further distances, 400+.