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|  MIL-B-70511B (AR)
f. Lower receiver. Remove all carbon residue from lower
receiver group assembly using cleaning solvent.
Drain excess solvent from lower receiver cavity and
dry.
4.5.4.2 Magazine. Twenty-one 30 round magazines shall be
numbered and used in rotation with each M16A2 rifle during this
test. Magazines shall be fully loaded for each use. Each
magazine used during this test shall be cleaned at the specified
cleaning interval for the rifle with a cleaning solvent in
accordance with MIL-C-372 and blown dry with prepared compressed
air.
4.5.5 Firing pin indent. The test shall be performed
utilizing Government approved chamber adapters and Government
furnished copper compression cylinders for insertion in the
barrel chamber.
4.5.5.1 Bolt manually returned. The rifle shall be held in
a vertical position (muzzle down) with the muzzle end supported.
The bolt shall be retracted to the rearward position and held
open. A zero indicator reading shall be made on the height of
the copper pressure cylinder before insertion into the chamber
adapter. The chamber adapter containing the copper compression
cylinder shall then be inserted in the barrel chamber. The bolt
shall be manually returned to the battery position, the trigger
shall be pulled to release the hammer and indent the copper
compressions cylinder. The chamber adapter shall be removed from
the barrel chamber and the depth of the indent on the copper
compression cylinder computed by measuring the distance from the
original zero indicator reading to the bottom of the firing pin
impression. The indent impression shall be visually examined to
determine if the concentricity requirement has been met.
4.5.5.2 Bolt sprinq action returned. The rifle shall be
held in a vertical position (muzzle down) with the muzzle end
supported. The bolt shall again be retracted to the open
rearward position and held open. A zero indicator reading shall
be made on the height of the copper compression cylinder before
insertion into the chamber adapter. The chamber adapter
containing the copper compression cylinder shall then be inserted
in the barrel chamber. The bolt shall be returned to the battery
position under spring action. The trigger shall not be pulled.
The chamber adapter shall be removed form the barrel chamber and
the depth of the indent in the copper compression cylinder
computed by measuring the distance from the original zero
indicator reading to the bottom of the firing pin impression.
4.5.5.3 Recording of data. The following data shall be
recorded:
a.
M2 Bolt serial number.
16
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