Browning machine gun caliber .50, M2, aircraft, fixed and flexible. Page: 26
54 p. : ill. ; 22 cm.View a full description of this book.
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TM 9-225
11 ORDNANCE DEPARTMENT
(4) Insert oil buffer tube assembly in oil buffer body and push
forward as far as it will go. Place accelerator, with tips up and
rounded surface to the front, between depressors on oil buffer body
and insert accelerator pin, taking care that both ends of pin are flush
with the sides of oil buffer body.
(5) See that the buffer is full of oil.
f. Adjustment of oil buffer.-(1) The oil buffer is so arranged that
it is possible to adjust the speed of the firing of the machine gun. This
is accomplished by turning the oil buffer tube the required number
of clicks, depending on whether a high rate of fire or a slower rate
is desired.
(2) Turning the buffer tube to the right tends to cut off or close
the oil buffer, which allows it to absorb more recoil and to reduce the
rate of fire.
(3) Turning the buffer tube to the left allows the oil buffer to open
and the oil to pass through larger throttling ports, which results
in an increased rate of fire.
(4) Normally, the buffer is set to obtain the highest rate of fire.
This setting is two notches to the right of the open position.
(5) Vertical buffer (fiwed gun).-On the back plate is a regulator
with index finger, with the letter O on the left side and the letters CL
on the right side of the graduated index, meaning open and closed.
The index finger is provided with a key which fits in a slot in the rear of
the buffer tube. Turning the index finger to the right turns the
buffer tube to the right; turning the index finger to the left turns the
buffer tube to the left, thereby opening or closing the oil buffer as
desired.
(6) Horizontal buffer (fixed and flexible gun).-The oil buffer tube
is turned by inserting a screw driver blade into the slot in the rear of
the buffer tube through the hole in the back plate.
g. Bolt group (fig. 6).-(1) Assemble firing pin spring, firing pin,
and firing pin extension and insert this assembly into firing pin hole
in bolt, with notch of firing pin extension down. (A special tool
for assembling the firing pin spring is being prepared for issuance.)
Push forward until striker projects through small hole in the front
of bolt.
Non.--See that it requires only a small force to push the firing pin and firing
pin extension forward. Also see that firing pin hole is free from grease and
foreign materials.
(2) Seat sear spring in its recess in bolt. Insert sear in its guides
in bolt. Press down on sear enough to allow sear slide to be inserted26
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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/m1/28/: accessed May 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.