The issued scopes where not that great.Yep. If I can post a target better than 1.5 MOA, even shooting well supported from bench with zero wind, it would be sheer luck even through the Krieger barrel. I would seriously doubt anyone claiming to shoot 1 MOA with a CMP legal Garand. I doubt it's possible with iron sights and probably not even with a scope. 'Seriously doubt' is a nice way of saying it would be complete BS.
Again, 4" group is fine.
2.5x on the C and i think USMC used 4x on the M1d.
Only advantage to these scopes where helping seeing target a bit better.
View: https://www.youtube.com/watch?v=jmiVuP_GXzA