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|  MIL-S-63348A(AR)
3.3.3.6 Handguard.
The two-piece handguards shall be held
firmly in place by the handguard cap and the spring loaded slip ring
in the barrel nut assembly. When the slip ring is depressed rearward
the handguards shall be capable of being removed.
3.3.4 Bolt carrier group
3.3.4.1 Key bolt carrier and striker assembly. The bolt
carrier key, and striker assembly shall move rough its full range
of travel without binding in the upper receiver. The carrier key
shall engage the gas tube freely when the bolt carrier moves in the
forward position. The bolt carrier key screws shall be torqued and
pinned in accordance with the applicable drawings.
3.3.4.2 Firing pin. The firing pin shall be retained in the
bolt and bolt carrier assembly by the retaining pin. The firing pin
shall move freely through its full range of travel in the bolt
carrier assembly. The firing pin protrusion shall be a maximum of
.036 inches and a minimum .028 inches. The chromium plating of the
firing pin shall be free of nodules, flaking, stripping, anode
burns, and evidence of etched base steel, except as specified on the
applicable drawing.
3.3.4.3 Bolt assembly. The bolt assembly shall be retained in
the bolt carrier by the bolt cam pin and shall move through its full
range of travel. The cam pin hole shall be swaged in accordance
with the applicable drawings to prevent improper assembly of the
bolt cam pin in the bolt assembly.
3.3.4.3.1 Extractor. The extractor shall be retained in the
bolt by the extractor pin. The extractor shall move through its full
range of travel under spring action without binding in the bolt and
shall be capable of engaging and extracting cartridge cases from the
barrel chamber when the weapon is function fired or manually
operated.
3.3.4.3.2 Ejector. The ejector shall be retained in the bolt
by the ejector pin and shall be held in the forward position by the
ejector spring. The ejector shall move through its full range of
travel under spring action without binding in the bolt and shall
eject cartridge cases completely out of the weapon when the weapon
is function fired or manually operated. When fully depressed, the
ejector pin shall be flush with or below the cartridge seat in the
bolt.
3.3.4.3.3 Cam pin. The cam pin shall be retained in the bolt
assembly by the firing pin. The cam pin shall move through its full
range of travel In the bolt carrier without binding. The cam pin
shall be capable of being removed from the bolt carrier without
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