US Soldier using an experimental flat-top receiver Colt Model 656 variation on the M16A1, with an M84 Scope. Vietnam, late 1960s period.

https://lemmy.world/post/44689132

how effective were those in a environment where you cant even see past 20m ?

Tell me you don’t know who Gunnery Sergeant Hathcock is without saying it.

He’s the longest sniper shot in Marine corps history. 1.4 miles in Vietnam. (Not the guy in the photo)

Also the M84 scope fitted in the photo was only 2.5x magnification. It was really low and more suited to a marksman role than a dedicated sniper role. Hathcock for example most commonly used an 8x scope, in comparison.