Razor 4.5x is a great optic, get in MIL; for the $ not much better

skip US Optics altogether

RPR isn't a bad gun at all, had one in 6.5 that did .8 with AMAX 120s... sadly couldn't get better groupings with the 140 ELD which is a much better round (over 1.0); regret selling it as it was solidly reliable with ZERO issues (most bolt guns that are messed with)

try diff match ammo with your SCAR and see what it groups at 100 in 5 shot groups

ammo means more than anything IMO if using same shooter/gun