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|  MIL-L-45589
retainer locknut is loosened or tightened, the elevating wheel for micro-
elevation adjustment of the sight aperture shall be capable of being
manually rotated causing the carrier, aperture, and retainer to move on
the frame assembly through the full range of adjustment. The elevating
wheel shall rotate freely between indexing positions and shall be restrained
in the indexing positions by the spring actuated indexing plunger. When
the frame assembly is in the upright position, and the carrier, aperture,
and retainer are moved vertically the sight aperture shall maintain con-
tact with the sight scale under spring tension and shall move laterally
on the aperture retaining screws.
3.9.5.4 After the setscrews on the frame assembly have been adjusted
and staked as specified on the applicable drawing~ the windage screw shall
be capable of being rotated manually causing the frame assembly, with
attachment components, to move laterally through the fill range of adjust-
ment. The windage screw shall rotate freely between indexing positions
and shall be restrained in the indexing positions by the spring actuated
indexing plunger.
3.9.5.5 When the scale lock screw is tightened, the spring pin shall
be positioned in the angular location specified on the applicable drawing
and the sight scale shall be locked in position on the sight frame. When
the screw is loosened, the scale shall slide through its full range of
adjustment.
3.9.6 Front sight. The front sight shall be capable of lateral
adjustment on the tenon of the barrel and, when adjusted, shall be locked
securely in position by the front sight screw. There shall be no relative
movement of these locked parts.
3.9.7 Receiver group. The hammer pin, safety bar pin, trigger pin,
and safety spring shall be retained securely by staking the receiver as
specified on the applicable drawings. With the stock assembly removed,
it shall not be possible to dislodge the hammer pin with the hammer in
both the cocked or uncocked positions, or safety bar pin by striking each
side of the receiver sharply against the palm of the hand and it shall
not be possible to unseat the safety spring by operating the safety.
3.9,8 Cocking lever and cocking arm. When the barrel of the launcher
is opened fully, the amount of engagement between the cocking lever and
the cocking arm, as depicted on Drawing F7790600, shall be not less than
3/16 of an inch.
3.9.9 Receiver and fulcrum pin. The straight headless (fulcrum)
pin shall be assembled securely to the receiver so that there shall be
no relative movement when an axial load of 200 pounds is applied gradually
to the pin.
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