quote:

Sturm, Ruger manufactured M77 bolt
action rifles from 1968 to 1991. The trigger
overtravel adjustment set screw
(shown on right) in a few of these rifles
may not be securely tightened and may
move too readily. This change in original
adjustment can, in extreme cases, either
cause the rifle to fire unexpectedly (with
the safety “off) or cause the rifle to not
fire at all. This may occur suddenly and
without warning.
Ruger M77 bolt action rifles produced
in later years have this set screw
permanently secured. These rifles have a “T” inscribed on the underside of
the bolt handle. This condition cannot occur in any of our other firearms as
their trigger mechanisms differ. Please note in particular that this condition
cannot occur in Ruger M77 Mark II bolt action rifles, which are of an entirely
different design.
For your safety, we ask that all owners of M77 rifles (except those with a
“T” underneath the bolt handle) contact us, using the coupon below.
You will receive a new locking screw that will replace your present overtravel
adjustment set screw and detailed instructions for quick, easy installation.
There is no charge for this service and replacing the screw will have
no adverse effect on trigger pull.
Do not use your M77 rifle until you have received and installed the replacement screw