Ordnance maintenance : Browning machine gun, caliber .50, all types Page: 4
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TM 9-1225
2-3 ORDNANCE MAINTENANCE
ground gun mounted on the machine gun tripod mount, caliber .50,
M3. The main difference between this gun and other types of cal-
iber .50, M2 guns is in the barrel, and oil buffer assembly. The barrel
of the gun need not be removed to adjust headspace, but must be
removed before withdrawing the oil buffer and barrel extension assem-
blies. In the oil buffer of this gun the piston valve and piston valve
key are omitted. The reason for this is that the heavy barrel does
not recoil with as much force as the lighter barrels of the other M2
machine guns. Omitting the piston valve and key allows the oil to
pass more freely through the openings in the oil buffer piston rod
head, offering less resistance to the recoil.
3. Characteristics.-All M1921 type guns are for left-hand feed
only. M1921A1 water-cooled guns cannot be used in the caliber .50
antiaircraft machine gun mount M2. All types of Browning machine
guns, caliber .50, M2, are alterable as follows:
a. Ammunition can be fed from left or right side by repositioning
of the parts pertaining thereto.
b. Operating and retracting slides can be changed from right to
left side of receiver by repositioning and changing the parts per-
taining thereto.
c. Guns can be converted from fixed to flexible (and vice versa) by
changing of parts concerned.
d. The buffer can be changed from horizontal to vertical by replac-
ing backplate with one having vertical buffer assembly.
e. The water jacket of the water-cooled gun, the barrel support of
the heavy barrel gun, and the trunnion adapter of the aircraft gun
may be quickly assembled to the receiver without thread qualification,
through use of a trunnion block shim. These shims, numbered from
1 to 12, differ in thickness by 0.0025 inch; number 1 shim is 0.0585
inch thick. Upon original assembly of the machine gun at place of
manufacture, the shim of correct thickness is assembled and the num-
ber of that particular shim and the next three higher numbers are
marked on the side plate and the rear end cap, trunnion adapter, or
barrel support. These three next higher numbered shims accompany
the machine gun as a thicker shim may be required later.
NoTE.-In order that the parts of the machine gun may be readily identified,
all components which are of sufficient size are marked to show the drawing and
last revision number; for example, the belt feed lever would be marked C-4057-2.
Parts which are too :small to permit use of the full drawing number are marked
to show the last revision, for example, -2.
f. The driving spring assembly of caliber .50, M2 guns (all types)
has been modified, and is now composed of a double spring (inner and
outer) assembled with modified driving spring rod assembly.
4
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United States. War Department. Ordnance maintenance : Browning machine gun, caliber .50, all types, book, June 12, 1942; Washington, D.C.. (https://digital.library.unt.edu/ark:/67531/metadc29982/m1/6/: accessed May 20, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.