Liberty machinery company is a stocking dealer of used gun drilling machines and reconditioned gun drilling machines. Gun drilling machines manufactured by, Eldorardo with Eldorado Mega Hi-Pressure Coolant System, Kays Engineering gun drilling machines, DeHoff Gun Drilling machines and Dadson Gun Drilling Machines. Often referred to as deep hole drills, single spindle and two-spindle design. D4554,Drills gun.