Its a vm all right but i would say probably more in the 40 to 50 dollar range if its working. Looks like you only have a chunk of the stock barrel in there, only one asa hook up. The vms are probably declining in value. As much as people collect old guns there are a million vms around but replacement parts like detents and springs are hard to come by.
Don't these usually have a powerfeed type feedneck? I don't see a feedneck on this one. Front screws for trigger guard missing, no barrel to speak of. How much other stuff is absent to make this marker worth buying? I'd say $50 MAX.