Need a little more info.... 'Colt 45' could be anything to a semi-auto 1911 pistol, old revolver, to a beer can/bottle. I think you can still get solidworks models of a 1911 slide & frame on CNCguns.com if that's what your looking for. Haven't seen any 3d models for something like an old Colt 45 SA army pistol-revolver.