Worrgame Products 62 caliber Sniper 1 with a serial of 62 078. The Asa line that runs from the vertical asa to the tank is missing and I think the top is drilled for a sight rail but missing the rail.
This 62 cal Sniper 1 has the transitional frame which came on later Sniper 1s and early Sniper 2s. It was used in between a sheridan and a sniper 2 / ranger frame.
Here is the 62 cal barrel and bolt removed from 62 cal Sniper 1.