It look like alot of Airsoft weapons or model weapons that he has .it looks like a browning 50.cal anti aircraft weapon ..
If there real then he has heck of a NFA weapon collection and he has enough money in the collection there to buy a new house with 40 acres without even thinking about ..
The last time i priced a M203 set up on the wall was $25,000.oo dollars set up and the browning 50.cal was around $55,000 dollars and up with the sale comeing from a few places that will sale them new to the public with the propler paperwork from the ATF with the $200.oo dollars transfer fee and fringerprint cards and then the cost of the dealer and then the price of the weapon on top of that ..
I been wanting a Beretta 93.r machine pistol with shoulder stock to match it to a supperssor i have in Az at the cabin for a great little BBQ gun to have fun with ..The price of a few 93.r in the states i found has been at price of $15,ooo.oo dollars and above ..