Browning machine gun caliber .50, M2, aircraft, fixed and flexible. Page: 42
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TM 9-225
24-26 ORDNANCE DEPARTMENT
b. Another type provided for special purposes is dummy ammunition
for training. Cartridges are inert.
25. Identification.-a. Even though the caliber .50 cartridges are
not marked or stamped to indicate the type or model, each type may
be identified as described in b below. In general, the only stamping
on the cartridge is the manufacturer's initials and the year of loading,
which appear on the base of the cartridge case. However, the mark-
ing on all original packing containers, both boxes and cartons, clearly
and fully identifies the ammunition except as to grade. (See par. 28.)
For further identification, an identification card approximately 61/2
by 15 inches, showing the quantity, type, caliber, model, ammunition
lot number, and manufacturer, is sealed inside the metal liner on top
of the ammunition in each box. In addition to the marking, colored
bands painted on the ammunition boxes and on carton labels provide
a ready means of identification as to type. (See par. 29a and b.)
b. When removed from their original packing containers, cartridges
may be identified, except as to ammunition lot number and grade, by
physical characteristics as described below and illustrated in figures
11 and 12. Care should be taken not to confuse the original markings
with any subsequent markings made with lithographic marking ink,
which is used for an entirely different purpose. (See par. 29c.)
(1) Ball.-Cartridge, ball, caliber .50, M2, is the standard ball am-
munition for this weapon. All caliber .50 service ammunition has
bullets with gilding metal jackets (copper colored).
(2) Armor piercing.-Caliber .50 armor piercing ammunition may
be identified by the nose of the bullet, which is painted black for a
distance of approximately 7/6 inch from the tip.
(3) Tracer.-Caliber .50 tracer ammunition may be identified by
the nose of the bullet which is painted red for a distance of approxi-
mately 7/16 inch from the tip.
(4) Incendiary.-Caliber .50 incendiary ammunition may be identi-
fied by the nose of the bullet, which is painted purple.
(5) Dummy.-Caliber .50 dummy cartridges may be identified by
three .2-inch holes in the bodies of their tin-coated cartridge cases,
and also by the absence of a primer. The gilding metal bullet jacket
of the dummy cartridge, caliber .50, M2, is tin coated, whereas that
of the dummy cartridge, caliber .50, M1, is not, thereby retaining its
copper color.
26. Model.-To identify a particular design, a model designation
is assigned at the time an item is classified as the adopted type. The
model designation becomes an essential part of the standard nomen-
clature of the item and one of the means of identification, for
example, M2.
42
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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/m1/44/?rotate=270: accessed June 21, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.