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Figure 10: Toggle delayed blowback action.
the bolt will strip a round from the locking chamber, but rather a cham-
magazine and feed and seat it in the ber that is simply held close. The
chamber. The bolt head will bottom toggle delayed action utilizes a toggle
out against the barrel, fully closing the mechanism to slow that chamber’s
chamber, and the slide will collapse opening. The design of the toggle cre-
against it. ates a mechanical disadvantage similar
to the lever delayed system.
There is only one known production
firearm that uses the hesitation-lock The toggle delayed blowback action
®
delayed action. The Remington uses a multi-piece breechblock that
Model 51 is a semi-automatic, hesi- is pinned together forming multiple
tation-lock delayed blowback pistol hinge joints. The front of the breech-
chambered in .32 and .380 ACP. The block is called the head and is pinned
Model 51 saw very high production to the center piece. The center piece
numbers (65,000) from 1918 into of the breechblock is pinned to the
the 1930s. Remington revamped the head and end piece and is called the
Model 51 in 2014 as the R51, which body. The opposite end of the breech-
still uses a hesitation-lock design, block is pinned to the receiver and is
but changed the blowback operation called the crank. In the closed posi-
to recoil-operated locking chamber tion, the pieces of the breechblock are
operation. parallel, in-line with the bore. When
the breech is completely open, the
› Toggle Delayed – The toggle delayed
body and crank will pivot upward, al-
action should not be confused with
most vertically.
the toggle lock action. The toggle
delayed action, like other delayed When the cartridge case begins to
blowback actions, does not feature a push against the breech head during
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