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2. Blowback (firearms) - Wikipedia

   en.wikipedia.org/wiki/Blowback_(firearms)

   The Heckler & Koch P9 semi-automatic pistol, CETME Ameli light machine gun, SIG MG 710-3, Heckler & Koch HK21 and Ohio Ordnance REAPR general-purpose machine guns also use it. Roller-delayed blowback arms are ammunition specific, since they lack an adjustable gas port or valve to adjust the arm to various propellant and projectile specific ...

3. Recoil operation - Wikipedia

   en.wikipedia.org/wiki/Recoil_operation

   Recoil operation. Recoil operation is an operating mechanism used to implement locked-breech autoloading firearms. Recoil operated firearms use the energy of recoil to cycle the action, as opposed to gas operation or blowback operation using the pressure of the propellant gas. [ 1 ]

4. ZB vz. 26 - Wikipedia

   en.wikipedia.org/wiki/ZB_vz._26

   The ZB-26 is a gas-operated, air-cooled, selective-fire machine gun. It has a finned, quick-detachable barrel and fires from an open bolt. Its action is powered by a long-stroke gas piston, located below the barrel. The gas block is mounted at the muzzle end of the barrel and also serves as the front sight base.

5. M60 machine gun - Wikipedia

   en.wikipedia.org/wiki/M60_machine_gun

   The M60 is a belt-fed machine gun that fires the 7.62×51mm NATO cartridge (similar to .308 Winchester), which is commonly used in larger rifles, such as the M14. It is generally used as a crew-served weapon and operated by a team of two or three individuals. The team consists of the gunner, the assistant gunner (AG), and the ammunition bearer.

6. London Underground battery–electric locomotives - Wikipedia

   en.wikipedia.org/wiki/London_Underground_battery...

   London transport portal. London Underground battery-electric locomotives are battery locomotives used for hauling engineers' trains on the London Underground network where they can operate when the electric traction current is switched off. The first two locomotives were built in 1905 for the construction of the Great Northern, Piccadilly and ...

7. Recoil buffer - Wikipedia

   en.wikipedia.org/wiki/Recoil_buffer

   The simplest form of recoil buffer is made from a resilient and deformable material (leather, rubber, polymer e.g. a rubber butt pad on a shotgun). [1] A second way of producing a recoil buffer is to insert a spring into the recoil train—the path/part (s) generating recoil impulse. This spring is mounted to the point (s) where the firearm ...