(6) Description of specific APE. It is not within the scope of this lesson to describe each piece of
equipment that is presently available. For discussion of specific APE, see TM 43-0001-47.
n. Profile and Alignment Gaging Operations.
(1) Profile and alignment gages are devices which simulate the breech block or chamber of a
weapon. These gages are precision-made instruments that are used to ensure the rounds will
chamber in the weapon after reassembly. An example of the use would be after the propellant in
a fixed round has been replaced, and the round has been reassembled and crimped. The gages
then assure that the round is not offset, thus not allowing the round to properly chamber, which
could cause serious damage to the weapon or cause the round to malfunction.
(2) Each profile and alignment gaging operation, excluding small arms ammunition, should be so
enclosed that adjacent operations are protected by operational shields complying with the
requirements of TM 9-1300-206. The layout of the equipment and operational procedure will be
developed with a view toward minimizing personal injury and property damage in the event of an
(3) During chamber gaging of major caliber fixed ammunition, the gage should be pointed toward a
dividing wall or other barrier and the round inserted into the gage and removed by the same
operator. In no case will the round be left in the gage. Rounds of mortar ammunition shall be
gaged prior to attaching propellant increments, and, unless prohibited by design characteristics,
prior to assembly of ignition cartridge.
4. You have completed the lesson. You will now take a Practice Exercise to use the knowledge you gained
in the lesson. Once you complete the Practice Exercise satisfactorily, proceed to the subcourse