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|  MIL-R-1296F(AR)
aperture can be reamed out to a diameter of at least one hundred
thousandths (.100) if the shooter so desires. The sight shall be
capable of accepting a variety of common US and foreign aperture
discs.
3.2.6.1.2 Marking. The sight shall be clearly and
indelibly marked to show the direction of knob rotation needed to
move the point of impact UP (or down) and left (or right) .
3.2.6.1.3 Backlash. When tested as specified in 4.6.2,
backlash and free movement shall not exceed one thousandths of an
inch (.001). When tested as specified in 4.6.2, the average
movement per click shall be within 15 percent of the nominal
movement specified in the operator's manual. The sum of any two
consecutive click movement shall be within 50 percent of the
nominal movement.
3.2.6.2 Front sight. The front sight shall be a target
type. It shall fit the standard 3/8 inch dovetail sight base.
It shall have at least nine (9) interchangeable inserts including
at least six (6) aperture type The smallest aperture shall be
within the range of .100 to .120 inches. The largest aperture
shall be within the range of .150 to .170 inches. The remaining
apertures shall be equally spaced throughout the range bounded by
the smallest and largest apertures. Inserts shall also included
at least three metal post-type sized 0.080 inch, 0.090 inch and
0.100 inch. The inserts shall be readily interchangeable by the
user. Nominal insert sizes shall be specified in the operator's
manual. Actual sizes shall be within one-thousandths ( .001) of
the nominal.
3.2.7 Safety device. A safety device shall be provided
which, when set at the safe position, shall prevent firing of the
rifle. It shall be moveable manually between the safe position
and the fire position and shall remain in the position set until
reset manually. Safety actuation forces shall be as specified in
3.3.2.
3.2.8 Finishes.
3.2.8.1 Machine finish. Machine finishes shall be in
accordance with good commercial practice for the type of rifle
furnished.
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