Definitely an M40, a modified Remington 700 short action in 7.62 NATO (note the safety and receiver shape). The scope is a Redfield 3X-9X Accu-Range, which were mounted in Redfield Sr one piece bases and Redfield 4-screw rings. The initial Accu-Range scopes had a matte anodized finish and were marked 1” TUBE , but later replacements were standard commercial high gloss.
The scopes allowed ranging out to about 600 yards. There were 2 horizontal stadia wires above the croosshairs that were used to frame the target by adjusting the magnification ring. As you adjusted the power, a small graduated scale projected into the bottom of the field of view. The scope was initially intended for deer hunting and you would frame the deer, back to brisket. The military framed the enemy chin to belt buckle.
The internal graduated scales were plastic and that was a major flaw. If you allowed the objective lens to point at the sun, the flag would start to melt, similar to the way kids fry ants with a magnifying glass.
When Remington released a run of M40 Commemoratives, the 3x9 Accu-Range scopes were bring around $1000. Last I looked, they’re down to around $400-$500. The front lens was constructed of 2 pieces glued together and the adhesive tended to get hazy with time. Iron-Sight scope repair can fix that for about $100, but the lead time is about 12 months. I’ve had a number of them over the years and still have at least one stashed away.
Here's a later commercial version. The graduated scales moves up or down ad you turn the magnification ring, to provide a reasonable estimate of the distance.
