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2. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   The trailer hitch ball attaches to a ball mount; with a diameter typically 1 ⁄ 16 inch (1.6 mm) larger than the ball bolt/shank diameter. [2] The ball mount must match the SAE hitch class. [3] The ballmount for a receiver-type hitch is a square bar that fits into a receiver attached to the vehicle.

3. Weapon mount - Wikipedia

   en.wikipedia.org/wiki/Weapon_mount

   Maxim gun mount type PS-31 from pillbox No. 186 of the Kiev Fortified Region. The mount includes elements of the machine gun cooling system. A swing mount is a fixed mount that allows a far greater and more flexible arc of fire than the simple pintle mount system. Utilising a system of one or two articulated arms the gunner can swing the weapon ...

4. Gun turret - Wikipedia

   en.wikipedia.org/wiki/Gun_turret

   "ventral" – underneath the fuselage, often on US heavy bombers, a Sperry-designed ball turret. "rear" or "tail" – at the very end of the fuselage. "nose" – at the front of the fuselage. "cheek" – on the flanks of the nose, as single-gun flexible defensive mounts for B-17 and B-24 heavy bombers

5. Bridgeport rig - Wikipedia

   en.wikipedia.org/wiki/Bridgeport_rig

   A modified hammer screw with a large head that protruded 3/4" from the frame would be installed on the Colt. This screw head would be inserted into the rig and held in place via a strip of spring steel that was attached to the gun belt via rivets. The shooter could rotate the revolver upward to fire without removing it from his belt if needed.

6. 3-inch/50-caliber gun - Wikipedia

   en.wikipedia.org/wiki/3-inch/50-caliber_gun

   The single mount was to be exchanged for a twin 40 mm antiaircraft gun mount, and the twin 3-inch/50 for a quadruple 40 mm mount, on Essex-class aircraft carriers, and Allen M. Sumner and Gearing-class destroyers. Although intended as a one-for-one replacement for the 40 mm mounts, the new 3-inch (76 mm) mounts were heavier than expected, and ...

7. Scarff ring - Wikipedia

   en.wikipedia.org/wiki/Scarff_ring

   Scarff ring on a Bristol F.2B at the Shuttleworth Collection. The Scarff ring was a type of machine gun mounting developed during the First World War by Warrant Officer (Gunner) F. W. Scarff of the Admiralty Air Department for use on two-seater aircraft.