MIL-DTL-63997C
2.4 Order of precedence. Unless otherwise noted herein or in contract, in the event of a
conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article inspection. When specified (see 6.2), a sample of the weapon shall be
subjected to first article inspection in accordance with Table II and 4.2.
3.2 Conformance inspection. Unless otherwise specified, all weapons shall be subjected
to conformance inspection in accordance with Table II and 4.3.
3.3 Upper receiver and lower receiver assemblies.
3.3.1 Upper receiver and lower receiver assembly retention. When the upper receiver
assembly and lower receiver assembly are attached and the takedown and pivot pins are pushed
to their extreme in positions, the upper receiver assembly and lower receiver assembly shall be
held securely in the closed position.
3.3.2 Opening of the upper receiver and lower assembly. When the takedown pin is
withdrawn to its extreme out position, the upper receiver assembly and lower receiver assembly
shall not be held securely in the closed position.
3.3.3 Detachment of the upper receiver assembly from the lower receiver assembly. The
upper receiver assembly shall detach from the lower receiver assembly when the pivot and
takedown pins are in their extreme out positions.
3.4 Lower receiver assembly.
3.4.1 Hammer. When the hammer is released from the cocked position, it shall pivot
forward to the stop position under spring action without binding (see 6.10.4).
3.4.2 Automatic sear.
3.4.2.1 Automatic sear motion. When the selector is placed in the "BURST" position, the
fire control selector shall rotate the automatic sear from its neutral position to its active position
(able to engage the hammer). When the selector is removed from the "BURST" position, the
sector shall rotate the automatic sear to its neutral position (unable to engage the hammer)
without binding.
3.4.2.2 Automatic sear action. When the fire control selector is in the "BURST" position
and the hammer has been cocked by backward motion of the bolt carrier, the automatic sear shall
engage and restrain the hammer until the sear is tripped by the forward motion of the bolt carrier.
3.4.3 Fire control selector.
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