Sheridan KP2
The KP2 produced in the late eighties was the successor to the earlier K1 & K2 bolt action paintball markers by Sheridan. It still had the side mounted tube magazine and ran on 12 gram Co2 cartridges but now it had a pump handle mounted under the barrel to load and cock the action.
The KP2 was followed by the KP3 which featured direct feed and was the last of the fully stocked paintball rifles from Sheridan. Brass and wood, so old school!