The tripod can be found in Academy's machine gun kit, the one with the several .50 styles and a couple .30's. A .30 with handle can be found in the Tamiya U.S. WW 2 equipment kit. This one has a shoulder stock, bipod and flash suppressor. A close look at your picture shows the gun does not have the shoulder stock.
If you are in the US, get back to me, I know I have the tripod and may vave the Tamiya .30 as well.