A breechblock is the part of the firearm action that closes the breech at the moment of firing. Most modern small firearms use a rotating breechblock, better known as a bolt, first used in manually operated bolt action weapons, but later made to work in automatic weapons. Some variations of non rotating breechblocks include: In firearms terminology, an action is the system of operation that the firearm employs to seal the breech (in a breech-loading firearm), and to load consecutive rounds. ... A bolt-action firearm is one that is manually operated (i. ...
blowback - in which the breechblock is closed by a powerful spring
Delayed blowback - as found in many weapons from Heckler und Koch
Tipping breechblocks - both self-actuating (AG-42 Ljungman is one example) and manually operated by a lever (Peabody action) or other means (Krag-Petersson)
Blowback is one particular system in which an automatic or semi-automatic firearm may operate. ... Heckler und Koch GmbH (H&K) is a German weapons manufacturing company famous for various series of small firearms, notably the MP5 submachine gun, the MP7 personal defense weapon and the G3 and G36 assault rifles. ... The Automatgevär m/42 (Ag m/42), commonly known as the AG42, the AG-42 or the Ljungman, is a Swedish semi-automatic rifle. ... The Peabody action was an early form of breechloading firearm action, where the heavy breechblock tilt downwards across a bolt mounted in the rear of the breechblock, opperated by a lever under the rifle. ... The Krag-Petersson rifle was the first repeating rifle adopted by the armed forces of Norway, and one of the first repeating arms adopted anywhere in the world. ... Exterior and cutaway view of the M1867 action The Remington rolling block M1867 was the first truly modern rifle to be adopted by the Norwegian Army. ...
The breechblock is a vertical sliding-wedge type, similar in principle to that of the 5/38.
When the gun is in battery and the breechblock is in its held-down position, the hold-down lever bears on the hold-down arm of the breech operating shaft, preventing rotation of the shaft and closing of the breech.
The breech interlock latch lever, the first mechanism in the chain of linkages from the breech face to the loader control lever, is pivoted in the shell-lock carrier next to the shell lock and extends down the breech face, partially in front of the breech opening.
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