Browning machine gun caliber .50, M2, aircraft, fixed and flexible. Page: 48
54 p. : ill. ; 22 cm.View a full description of this book.
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TMI 9-225
33-35 ORDNANCE DEPARTMENT
are standard items of issue with the exception of the dummy car-
tridge, caliber .50, M1, which is limited standard:
Cartridge-Armor piercing, caliber .50, M2.
Ball, caliber .50, M2.
Dummy, caliber .50, M1.
Dummy, caliber .50, M2.
Incendiary, caliber .50, M1.
Tracer, caliber .50, M1 or M2.
34. Ballistic data.-The average velocities of the several types
and models of caliber .50 ammunition used with the Browning ma-
chine gun, caliber .50, M2, aircraft, fixed and flexible, are shown
below:
Average velocity
Type and model 78 feet from muz-
zle (feet per
second)
Cartridge, armor piercing, caliber .50, M2------------__ 2, 900
Cartridge, ball, caliber .50, M2 _________________ 2, 900
Cartridge, incendiary, caliber .50, M1
Cartridge, tracer, caliber .50, ML ------------------------------- 2, 830
35. Defects found after firing.-a. Misfire.--(1) Primer shows
normal impression of firing pin. Such a misfire indicates that the
primer is defective.
(2) Primer shows light impression of firing pin. Such a misfire
indicates that the force of the blow struck by the firing pin is not
sufficient to ignite the primer. This is generally caused by some
mechanical defect in the weapon, such as short or broken firing pin,
a weak firing pin spring, the bolt of the weapon not being completely
locked, or by grease in the firing pin hole in the bolt, which cushions
the blow of the firing pin. It may also be caused by a defective car-
tridge or primer.
(3) Primer shows normal impression of firing pin but off center.
This is caused by a defect in the weapon.
b. Hangfire.-Delayed ignition of the powder in the cartridge may
be caused by a small or decomposed primer pellet, damp powder, or a
light blow of the firing pin caused by dirt or a defect in the weapon.
While a hangfire is a serious defect if the delay is long enough to
permit the bolt to be opened before the powder burns completely, such
delay is rarely found in practice. Should a hangfire of several48
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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/m1/50/: accessed May 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.