Ruger M77 - Manual (Page 19)

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7. To remove the sear:
a. Press out the sear pivot pin.
b. Turn receiver upside down and slide sear forward. Sear will drop out of the
top slot in the receiver.
8. To remove safety assembly:
a. Rotate the safety selector so that the upper section is positioned fully over
the center of the receiver tang.
b. While holding the safety selector in place with thumb and forefinger, slide
the retainer up out of receiver. (Caution: Safety Selector is under spring
tension from a spring and plunger acting against the lower section of the
safety selector. The spring and plunger will jump out if not contained.)
c. Lift out the safety selector.
d. Remove the safety selector detent and safety selector detent spring.
REASSEMBLY
(Again, Be Sure Rifle Is Unloaded)
1. To replace the safety assembly:
a. Place the safety selector detent and safety selector detent spring into the
hole in the receiver.
b. Set the safety selector in place with its upper section positioned over the
center of the receiver tang.
c. While holding the safety selector in place with thumb and forefinger while
applying downward pressure, slide the safety selector retainer into dovetail
from the top. Align the notch in the safety selector retainer with the sear pivot
pin hole.
2. To replace the sear:
a. Place the rear end (the end with the hole in it) of the sear into the slot from
the top of the receiver. Swing the rear end of the sear up and slide the sear
into position until the hole in the sear is aligned with the mating holes in the
receiver.
b. Insert the sear pivot pin.
3. To replace the trigger:
a. Place the trigger/sear spring over the dimple in the trigger.
b. Assemble the trigger while aligning the spring with the dimple on the sear.
c. While holding the trigger in position, replace the trigger pivot pin.
4. To replace the stock:
a. Install magazine box on receiver.
b. Place barrel-action assembly – with magazine box in place – into stock.
c. Replace trigger guard and loosely install screws.
d. Install floorplate hinge assembly and firmly tighten screw. (This screw is
angled and draws the barrel-action assembly into the bedding surface of the
stock.)
e. Tighten the two trigger guard screws as follows: Do not tighten one screw
all the way and then tighten the other. Instead, alternately tighten each one –
a partial turn at a time – so that the screws will be tightened equally until both
are snugly tightened.