Flapper locking is a type of locking mechanism used in firearms. It involves a pair of flappers on the sides of the bolt that each lock into an outwards recess in the receiver as the bolt is in battery. As the bolt is forced backwards after the firing of a cartridge, the flappers recede back into the bolt, therefore unlocking and sending the bolt backwards to cycle the gun. The design was patented in 1870 by Lieutenant Friberg of the Swedish Army, but the first actual example of a firearm that used this was made by another Swedish man named Kjellman in 1907. Most use of flapper locking came from the designs of the Soviet Union's
Vasily Degtyaryov
Vasily Alekseyevich Degtyaryov (; 2 January 1880, Tula – 16 January 1949, Moscow) was a Soviet and Russian engineer who specialized in weapons design. He was awarded the title of Hero of Socialist Labour in 1940.
Biography
He was a factory ...
in the years surrounding World War II.
Examples
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Gewehr 41
The Gewehr 41 , commonly known as the G41(W) or G41(M), denoting the manufacturer ( Walther/ Mauser), are two distinct and different battle rifles manufactured and used by Germany during World War II. The Walther variant of the G41 was far mor ...
(Walther)
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Gewehr 43
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Degtyaryov machine gun
The Degtyaryov machine gun ( literally: "Degtyaryov's infantry machine gun") or DP-27/DP-28 is a light machine gun firing the 7.62×54mmR cartridge that was primarily used by the Soviet Union, with service trials starting in 1927, followed by ge ...
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RPD machine gun
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DShK
The DShK M1938 (Cyrillic: ДШК, for ) is a Soviet heavy machine gun. The weapon may be vehicle mounted or used on a tripod or wheeled carriage as a heavy infantry machine gun. The DShK's name is derived from its original designer, Vasily Degtya ...
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EM-2 rifle
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AVS-36; used as secondary locking
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MG 51
*Mauser 25
*Mauser 1906/08 pistol and 1905/06 rifle
*Ulfbehrt (Alexander Arms)
See also
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Roller locked (similar)
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Rotating bolt
Rotating bolt is a method of locking the breech (or rear barrel) of a firearm closed for firing. Johann Nicolaus von Dreyse developed the first rotating bolt firearm, the "Dreyse needle gun", in 1836. The Dreyse locked using the bolt handle ra ...
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Bolt action
Bolt action is a type of manual firearm action that is operated by ''directly'' manipulating the turn-bolt via a bolt handle, most commonly placed on the right-hand side of the firearm (as most users are right-handed). The majority of b ...
References
Firearm actions
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