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Page Title:
Section IV. CALIBER .30 AND 7.62-MM MACHINE GUN |
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 TM 9-4933-208-34
the barrel to avoid unnecessary wear
Caution: Do not gage a hot barrel.
and damage.
An incorrect reading will result and
the collet may seize in the bore.
Section IV. CALIBER .30 AND 7.62-MM MACHINE GUN
(2) The tapered rod is pushed gently, but
2-4. Gaging Operation of Caliber .30
firmly, into the gage tube until it is
and 7.62-MM Machine Gun
stopped by the collet engaging the
bore.
a. To measure wear of the barrel, proceed as
(3) The reading is taken from the rod at
follows:
the rear of the gage tube.
b. When reject ring is visible, barrel is serv-
(1) Retract the tapered rod, and insert
iceable.
the gage into the barrel until the
breech stop is seated flush against the
c. Retract the tapered rod before removal
breech end of barrel.
of gage.
Section V. CALIBER .50 MACHINE GUN
operations. Check the breech stop setting
2-5. Gaging Operations of Caliber .50
prior to insertion of gage in all caliber .50
Machine Gun Barrels
barrels.
(4) Retract the tapered rod, and insert the
Note. The liner of the M85 barrel is not to be gaged.
gage into the barrel until the breech
a. To measure wear in the liner, of caliber
stop is seated flush against the breech
.50 barrels, proceed as follows:
end of barrel.
(1) Engage the breech stop in one of the
(5) The tapered rod is pushed gently, but
two forward grooves.
firmly, into the gage tube until it is
(2) The letters AC on the gage tube are
stopped by the collet engaging the
revealed immediately to the FRONT
bore.
(6) The reading is taken from the rod at
of the stop, for checking aircraft
the rear of the gage tube. The re-
barrels.
cessed portion of the rod indicates that
(3) The letters HB on the gage tube are
the barrel is new or no appreciable
revealed immediately to the FRONT
wear.
of the stop, for checking M2 heavy
b. To measure wear ahead of the liner, move
barrels.
the breech stop to one of the rearward grooves.
Note. The markings AC, HB, and M85
Use of the gage is the same as a above.
will not be visible during actual gaging
Section VI. MAINTENANCE
oil. When not in use, wipe clean and oil and
2-6. Maintenance of the Gages
keep the gages in the case as a protection
Before using the gages, wipe with a clean,
against possible damage.
dry cloth to remove foreign particles, dirt, and
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