Browning machine gun caliber .50, M2, aircraft, fixed and flexible. Page: 13
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 8-9
groove of piston rod. Push forward as far as oil buffer will go, having
accelerator back as far as possible. This will lock these components
together so that the barrel, barrel extension, and oil buffer assembly
may be placed in the casing of the gun as a unit. Push this unit
forward in the receiver group until lock of oil buffer seats in recess
in the side plate.
b. Press cocking lever forward in bolt and insert bolt into receiver
group. Push bolt forward until hole for bolt stud is in line with
enlarged opening in center of slot in the side plate. Insert bolt stud
in bolt, being sure that the collar on bolt stud is inside the side plate.
Push bolt completely forward, guiding extractor from the front with
the fingers to prevent it from catching.
c. Insert driving spring rod assembly into hole in the bolt. Engage
driving spring rod retaining pin in its seat in the right-hand side plate.
d. Replace back plate. Tighten the buffer disk screw as tight as
possible. When replacing back plate, make sure latch lock is in the
unlocked position until back plate is latched.
e. Close and latch cover.
9. Head space.-a. General.-The head space of a military
weapon with a cartridge fully seated in the chamber is the distance
between the base of the cartridge and the face of the bolt. In Brown-
ing machine guns, the head space is adjusted by obtaining the proper
distance between the forward part of the bolt and the rear end of the
barrel. The head space adjustment must be checked before firing.
b. Head space adjustment.-(1) In the past, the head space has been
adjusted with the barrel, barrel extension, and bolt out of the gun.
However, the best adjustment is obtained with the gun fully assembled.
(2) To adjust the head space with the gun assembled, screw barrel
into barrel extension, using the point of a cartridge, until the action
will just cloge without being forced. Then unscrew the barrel two
notches.
Caution: Care must be exercised to avoid roughening the barrel
surface during adjustment.
c. Checking head space and timing.--Where head space and timing
gage, caliber .50, BMG, A196228, is available, head space and timing of
the gun should be checked as herein prescribed, using this gage, instead
of usual methods.
(1) To check head space.-(a) Head space the gun in the manner
prescribed.
(b) Cock the firing pin.
(c) Retract the bolt slightly in order to relieve the pressure between
the bolt and the end of the barrel which is caused by the driving spring.13
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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/m1/15/: accessed May 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.