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2. Falling-block action - Wikipedia

   en.wikipedia.org/wiki/Falling-block_action

   Ruger No. 1 single-shot falling-block rifle in .243 Winchester with custom barrel with action open. See also: Firearm action § Dropping block A falling-block action (also known as a sliding-block or dropping-block action) is a single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the ...

3. Breechblock - Wikipedia

   en.wikipedia.org/wiki/Breechblock

   A typical break-action, double-barreled shotgun. A way of closing the breech or chamber is an essential part of any breech-loading weapon or firearm.Perhaps the simplest way of achieving this is a break-action, in which the barrel, forestock and breech pivot on a hinge that joins the front assembly to the rear of the firearm, incorporating the rear of the breech, the butt and usually, the ...

4. Breechface - Wikipedia

   en.wikipedia.org/wiki/Breechface

   The breechface is the front part of the breechblock that makes contact with the cartridge in a firearm. The breech block (or breechblock) in a gun is what holds a round in the chamber, and absorbs the recoil of the cartridge when the round is fired, preventing the cartridge case from moving. [1]

5. Action (firearms) - Wikipedia

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

   In 2020, CZ also introduced CZ 515, a bolt-release modified version of the CZ 512, to the Australian market via its importer Winchester Australia. The Turkish manufacturer Pardus Arms also produces the 12 gauge-caliber BRS17 shotgun, which uses a bolt release button on the back of the receiver to chamber rounds before firing.

6. Trapdoor mechanism - Wikipedia

   en.wikipedia.org/wiki/Trapdoor_mechanism

   The hinged breechblock caused these rifles to be named "Trapdoor Springfields". [3] The conversion from musket to breechloader was done by milling open the barrel's breech section and inserting a hinged trapdoor fastened to the top of the barrel. A thumb-operated cam latch at the rear of the breechblock held it shut when in closed position.

7. Bolt (firearms) - Wikipedia

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

   In most automatic firearms that use delayed blowback, recoil, or gas operation, the bolt itself is housed within the larger bolt carrier group (BCG), which contains additional parts that receives rearward push from a gas tube (direct impingement) or a gas piston (short-stroke or long-stroke piston) system.

8. Interrupted screw - Wikipedia

   en.wikipedia.org/wiki/Interrupted_screw

   The screw is mated with a partially threaded hole in the receptacle: threadless channels in the breechblock screw line up with the threaded parts of the receptacle, and vice versa. The screw can thus be smoothly inserted all the way into the receptacle, after which as little as one-eighth of a turn can engage the two sets of threads securely ...

9. Winchester Model 21 - Wikipedia

   en.wikipedia.org/wiki/Winchester_Model_21

   The Winchester Model 21 is a deluxe side by side shotgun.The shotgun's initial production run from 1931 through 1959 yielded approximately 30,000 guns. Winchester Repeating Arms Company ceased the main production line of this shotgun in 1960 and the Model 21 was sourced to the Winchester Custom Shop until the gun's retirement in 1991.