Ordnance maintenance : Browning machine gun, caliber .50, all types Page: 3
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TM 9-1225
BROWNING MACHINE GUN, CAL. .50, ALL TYPES 2
d. M2, aircraft, fixed and flexible types (fig. 2).-These guns are
air-cooled and can be mounted fixed or flexible in aircraft. The fixed
type gun is furnished with an operating slide for hand operation, and
a back plate having a horizontal (or vertical) buffer. The gun is
fired by a trigger motor and synchronizing mechanism. The flexible
type gun is furnished with a retracting slide for hand operation, and
a back plate having a horizontal buffer, double spade grips, and a hand
trigger. Sights for this gun are carried as airplane equipment.
e. M2, aircraft, basic (fig. 3).-This gun may be described as a
Browning machine gun, caliber .50, M2, aircraft, fixed, from which
the operating slide group assembly has been removed and to which a
trigger bar and trigger bar pin assembly have been added. This gun
can be made into either the fixed or flexible type by the addition of
an operating slide group assembly (for the fixed type) or a retracting
slide group assembly (for the flexible type). The fixed type of gun
obtained by adding an operating slide group assembly to a basic type
of gun differs from the Browning machine gun, caliber .50, M2, air-
craft, fixed, by having a trigger bar and trigger bar pin assembly,
whereas the latter gun does not.
f. M2, water-cooled, flexible (fig. 4).-As a flexible antiaircraft
weapon this gun can be used with the antiaircraft machine gun tripod
mount, caliber .50, M1, or with the antiaircraft machine gun mount,
caliber .50, M2. The latter mount is normally assembled with tripod
legs, and designated as antiaircraft machine gun tripod mount, cali-
ber .50, M2. By removing tripod legs and assembling a pedestal base,
the mount may be placed on decks or other permanent positions, and
is then designated as antiaircraft machine gun pedestal mount, cali-
ber .50, M2. This gun is used as a fixed antiaircraft weapon when
mounted in the cradle of the 37-mm gun on antiaircraft gun carriage
M3E1. Two machine guns, caliber .50, M2, water-cooled, are mounted
rigidly in the cradle, one on each side of the 37-mm cannon. Until
recently all guns of this type were provided with spade grips on the
back plate. However, Browning machine guns, caliber .50, M2,
water-cooled, flexible, now being supplied are provided with back
plates which have triggers and trigger safeties but no spade grips.
The spade grips were eliminated because they were inconvenient when
the gun was used on the M2 antiaircraft machine gun mount. This
gun can be used with a 36-inch or a 45-inch barrel. All Browning
machine guns, caliber .50, M2, water-cooled, which are now in service,
except about 390, are of the 45-inch barrel type.
g. M2, heavy barrel, fixed and flexible types (fig. 5).-These guns
are air-cooled, and can be mounted in combat vehicles, or used as a
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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/m1/5/: accessed May 10, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.