We could have really benefitted from a fleet-wide purchase of the C1 "Sniper Scope" as well, giving every rifleman a combat optic decades before the Canadian Armed Forces actually pioneered such widespread optic use.
Funny your thoughts on optics for a battle rifle from '60s-80s.
The US route was to pour the developmental funding equivalent of space shuttle level of funding into turning an M14 into something precise and only got something that people were afraid to stare at hard because it would affect it's accuracy negatively.
The UK adopted a receiver body cover for STANAG mounts that most often was a SUIT or Trilux issued one or two to a platoon then a section perhaps at best. For anyone remembering all the bins of SKS body/receiver covers with scope mounts at US gun shows, laugh all you want, this was the FAL solution too.
A lot of the Belgians and Dutch did a tiny adoption of the FAL STANAG body cover and the German ZF1 4x24 scopes.
Canada actually was in at the start with the UK for optics development, but then ran away at high speed. You might have been lucky enough to have knwon an old infantryman who had both an autographed Bible and knew someone or saw one of those early scopes used during the FN trials of the mid to late fifties. There was occasional word of a body/dust cover and scope, but they were more rare than Sasquatch sightings.
The Australians pretty much said forget it, irons or nothing. Same for the South Africans.
The Kiwis were small enough that nothing was ever official but locals probably jut bought one offs from everywhere.
The only western adoptions that were any good were either the German, Swiss and French.
The Germans adopted an approach to having one rifle per section with a low power scope. So they created this monstrosity of engineering that looked like a deformed transformer that would clamp n to their G3 by a thumb clamp. Best thing about it was the scope, the ZF1 4 power by 24mm built by either Schmidt and Bender, Zeiss or Karl Kapps. Nice big centered fence picket like the Elcan, not upside down like the SUIT. It also has a reticle bar and minor posts left and right for aim off and measuring. It probably had as much if not more influence on our Elcans than the Brit optics.
The Swiss eventually decided on a slide on clamp for their new STGw90s, but this is a generation too late for the story, over engineered, overpriced and still manages to employ a thumb clamp push.
The French, at Manurhin no less, made a sight block that compresses against the rear sight, slides forward against the square fitting on the front of the receiver top and uses a push button to unlock. HOORAY for private enterprise since it fits the Manurhin made 540s and een the PE90s too!
They even made a big brother for the 542. The top is set for the 1970s STANAG sight mount, the older two castle turret ones. Happily, the Bundeswehr dumped most of their ZF1 scope as surplus over the last ten years and I managed to score enough for all my smurfgewhrs.
I am a fair shooter, not your competition type known to pick the fly excrement out of a pepper shaker type. No, not that guy. I take more pride in the height of my pile of brass.
My findings with optics are that with the 5.56 round, it compliments the accurate nature of the round. What was a figure 11 battle target at 400m, is now a case of where precisely, you want your shot placement at 400m. A Volkswagon Beetle sized target at 600m, turns into a figure 11 sized battle target challenge at 600m.
Optics with 7.62,,,oh boy,,,different world. You will hit targets to 400m ok. Have no expectation that your shot accuracy matches where they necessarily hit. The combinations or recoil, rifle and less accurate nature of the round open everything up. The optics will now help your observation and follow up. Past 400m, a hillock or a bush are still a hillock or a bush, only you might see better the results of the strike.
I do know guys who used iron sight FNs out to 400m plus. A lot of the 7.62 talk always reminds me of all those rifles circa the first world war and having their range scales going out to 2,000 yards and meters. Once you get to it, it is the world of either accurizing or of inherent accuracy built into the rifle like the AR10,,,and constant training.
Surprisingly the Russians turned to the old world solution of fixing the optic to the side of the receiver, but did it in such a way as to make universal mounts out of them. It has worked so well that only now are they slowly changing over to a rail system