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|  MIL-L-45589
3.9.3 Trigger and sear. With the hammer cocked, and the safety in
"fire" position, the trigger and sear shall return to their original
positions under spring action after any partial trigger pull short of
releasing the hammer. The trigger and sear shall also return to their
Original positions after any trigger pull with the hammer in the cocked
or released position.
3.9.3.1 Trigger guard assembly. The trigger guard assembly shall
be retained on the receiver by the staked trigger guard bracket screw
and by assembly with the detent assembly, detent spring, and detent spring
housing. When the detent spring housing is fully depressed, the trigger
guard shall be capable of being manually rotated on the trigger guard
rivet and the detent plunger between the normal vertical position of the
guard and both open positions, with only slight bind. The spring
actuated detent assembly shall lock the guard in any of the three positions
when pressure on the detent spring housing is released and the locking
hole is rotated into alinement with the detent.
3.9.4 Firing pin. The firing pin shall be retained in the receiver
by the firing pin retainer, which shall be drawn up to the torque specified
on the drawing. The firing pin shall move though its full range of travel
under spring action without binding. When the firing pin is moved forward
through partial or full travel, it shall be returned to, and held in, its
original retracted position by spring tension so that the point is flush
with, or below, the breech face.
3.9.5 Sight assembly.
3.9.5.1 The sight base shall be oriented with respect to the barrel
and sight base index marks and shall fit snugly on the barrel so that
there shall be no relative movement after the sight base screw is drawn
up with the torque specified on the applicable drawing and the head of
the screw is drawn up with the torque specified on the applicable drawing
and the head of the screw is positioned in the radical groove on the
barrel.
3.9.5.2 When the sight lock is depressed, the frame base and frame
assembly with attached components shall be capable of being manually ro-
tated, without bind, on the windage screw between the upright locking
position and the forward or folded-down locking position. The frame base
shall lock into each position under spring action of the sight lock when
pressure on the lock is released.
3.9.5.3 When the retainer lock nut is tightened, it shall lock the
aperture carrier, together with the sight aperture and aperture retainer,
in any position on the frame assembly. When the retainer lock nut is
loosened and depressed, the carrier, aperture, and retainer shall be capable
of being moved manually on the frame assembly through their full range
of adjustment. When the retainer locknut is released, the carrier, aperture,
and retainer shall be held in position under spring tension. When the
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