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The breech block screw incorporates multiple threaded "steppings" of progressively larger radius and a gap step occupying each circular section.A three step breech block screw's circular area would nominally be divided into quarters, with each quarter containing three threaded sections of progressively increasing height and a gap step for insertion.
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 ...
A breechblock (or breech block) is the part of the firearm action that closes the breech of a breech loading weapon (whether small arms or artillery) before or at the moment of firing. It seals the breech and contains the pressure generated by the ignited propellant. Retracting the breechblock allows the chamber to be loaded with a cartridge.
A plug-shaped breechblock was screw-threaded so that rotating the handle underneath would lower and raise it for loading with ball and loose powder; the flintlock action still required conventional priming. The Hall rifle: First U.S. cavalry breechloader, originally made in flint but later made-in and converted to percussion in 1830s–1840s ...
The terms "breechblock" and "bolt" are often used interchangeably or without a clear distinction, though usually, a bolt is a type of breechblock that has a nominally circular cross-section.
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.
The M-30 used many elements from existing guns, most notably the interrupted-screw breechblock of the M1910/30. Since at that time Soviet industry had experienced major difficulties with manufacturing sliding breechblocks (as used by the F-25) for large caliber guns, the lowered technical risk can be considered a significant advantage.
It had a hydrospring recoil system, interrupted screw type breechblock, and a 1/16-inch gun shield. [7] Side view of the improved Type 38 with an inset shot of the breech. Many Type 38 field guns were extensively modified at the Osaka arsenal between 1926 and 1935.
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