Browning machine gun caliber .50, M2, aircraft, fixed and flexible. Page: 9
54 p. : ill. ; 22 cm.View a full description of this book.
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TM 9-225
BROWNING MACHINE GUN, CALIBER .50, M2 4-5
(2) To unload.-(a) Lift cover, remove belt, retract bolt, and make
visual inspection of feedway, T-slot, and chamber to make certain that
gun is unloaded.
(b) Release bolt and lower cover.
(c) Press trigger or sear mechanism to relieve tension on firing pin
spring.
5. Mechanical operation.-Mechanical operation is operation
automatically performed by the gun itself when fired. The following
description of mechanical operation begins with the gun assumed to
be loaded and ready to fire.
a. Back plate trigger action on first shot (flexible gun only).-When
the rear end of the trigger, which is pivoted in the center, is pressed
down, its forward end pushes up the rear end of the trigger bar; the
trigger bar being pivoted in the center acts as a lever and causes the
front end to press down upon the top of the sear, forcing the sear
down and releasing the sear notch from the shoulder of the firing
pin. The firing pin spring forces the firing pin forward to fire the
cartridge.
b. Synchronizing mechanism action in firing (fixed gun only).--A
stroke of the trigger motor slide forces the sear slide inward. This
in turn forces the sear downward, releasing the sear notch from the
shoulder of the firing pin. The firing pin spring forces the firing pin
forward to fire the cartridge.
c. Remote control action in firing (fixed gun only).-A stroke of
the solenoid sear plunger forces the sear slide inward and sear down-
ward, releasing the sear notch from the shoulder of the firing pin.
The firing pin spring forces the firing pin forward to fire the cartridge.
d. Backward movement of recoiling parts.-Explosion of the car-
tridge forces the barrel to the rear, carrying with it the barrel extension
and the bolt which is locked to the barrel extension by the breech lock.
When the barrel has recoiled about 3/4 inch, the breech, lock pin strikes
the cam surfaces of the breech lock depressors. This unlocks the bolt
from the barrel extension and permits the bolt to continue to the rear.
As the barrel extension moves to the rear, it strikes the accelerator
and turns it backward.
e. Backward action of accelerator.-As the accelerator turns back-
ward, it strikes the bottom projection on the bolt and accelerates it
to the rear. The shoulders on the barrel extension shank engage be-
hind the claws of the accelerator, locking the barrel and barrel exten-
sion in a rearmost position to the oil buffer body.
f. Backward movement of bolt.-As the bolt moves backward, the
driving springs are compressed. There are two driving springs, one454576-42-2
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United States. War Department. Browning machine gun caliber .50, M2, aircraft, fixed and flexible., book, April 30, 1942; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc29988/m1/11/: accessed May 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.