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Again, the term refers to the lock mechanism, so a lock can be both a mortise lock and a lever tumbler lock. In the modern lever tumbler lock, the key moves a series of levers that allow the bolt to move in the door. [5] Pin tumbler lock, commonly used for mortise locks in the US. The next major innovation to mortise lock mechanisms came in 1865.
Animation of a lever tumbler lock mechanism. A lever tumbler lock is a type of lock that uses a set of levers to prevent the bolt from moving in the lock. [1] In the simplest form of these, lifting the tumbler above a certain height will allow the bolt to slide past.
[3] [4] [5] More specifically, it refers to the mechanism or lock of such firearms. It may also refer to a gun's lock which uses slow match to ignite the powder charge. [6] [7] The matchlock was a lever mechanism that simplified the ergonomics of firing. Slow match would be held clear of the flash pan in a spring-loaded pivoting arm (the ...
This gun used a standard "fixed" cartridge with 15 lb (6.8 kg) shell, hence a single set of tables applied to all its ammunition. Range tables for US 3-inch field gun , models 1902–1905. Range table for British 3 inch (76.2 mm) Stokes Mortar, 1917
A small Chubb detector lock from a gun case (circa 1910) In 1820, Jeremiah joined his brother Charles in starting their own lock company, Chubb Locks. They moved from Portsmouth to Willenhall in Staffordshire, the lockmaking capital of Great Britain, and opened a factory in Temple Street. In 1836 they moved to St James' Square in the same town.
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
For firearms having a rifled barrel, the bullet typically extends forward from the leading edge of the cartridge case. The portion of the barrel forward of the chamber that provides clearance for the loaded bullet of a cartridge is known as the throat. The throat is composed of both a freebore and a leade. [6]
For example on an AR-type rifle, the mil-spec distance from center of bore to top of rail is 1.211 inches, or approximately 31 mm (1.2 in). The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1.4–1.5 in) (higher and lower mounts are also readily available).