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|  MIL-R-1296F(AR)
3.2.3.1 Barrel and receiver assembly. The barrel and
receiver shall be rigidly joined to assure that the interface
shall not loosen during normal handling or extended use to the
detriment of accuracy, center of impact, reliability, or
durability.
3.2.4 Bolt assembly. The bolt shall be free of cracks,
burrs, tool marks, scratches and mutilations. Mirror scratches
and tool marks which do not adversely affect the rifle's ability
to meet the requiremnts of this specification, Which are in
conformity with good commercial practice, shall not be considered
defects. It shall move freely through its full range of travel
without binding. When the rear sight is zeroed for 50-yard
firing, there shall be a mininmm of 5/16 inch clearance between
the sight and the bolt as it is cycled.
3.2.5 Trigger. The trigger shall return to its normal
forward position immediately upon release after partial or
complete trigger pull.
3.2.6 Sights. The iron sights shall be mounted so that the
sight aperture is not more than 1 3/8 inches and not less than
1 1/4 inches above the centerline of the bore when the rifle is
zeroed for 50-yard shooting. The iron sights shall be readily
removable/attachable by the shooter to facilitate interchange of
iron and telescopic sights. After adjustment, the sight,shall
maintain its setting during all firing, including targeting and
endurance (see 3.3.5 and 3.3.6). Any tools needed for removal
replacement, or adjustment of the sights shall be provided with
each rifle.
3.2.6.1 Rear sight. The rear sight shall be target-type, "
click-adjustable for windage and elevation. The nominal movement
per click shall be the same for both windage and elevation.
Movement from click to click shall be distinct, but not difficult
to achieve. Clicks shall be nominally 1/4 minute or finer in
windage and elevation. The nominal movement per click shall be
specified in the operator's manual in minutes of angle shift of
If additional click movement information is
bullet impact.
presented in the operator's manual, it shall be presented in
equivalent terms (e.g., .191MOA= .20 at 100 yards - .00155
inches of sight movement = 1 click nominal) .
3.2.6.1.1 Disc. The rear sight shall have a threaded
removable aperture disc with an aperture diameter of forty-five
thousandths plus and minus five thousandths of an inch {.045
.005). The aperture disc shall be designed such that the
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