Red Dot

[lefthandedasian]

If you can afford it go Aimpoint. But if they're out of your budget, there's a YouTuber named FocusTripp who drop tests optics similar to Forms methods. From recollection he's a fan of the budget Sig Romeo 5 series. After numerous drops on steel plates and rocks at shoulder height his Romeo 5 was still shooting in the same hole. I forget what distance he was testing it at (he does more tactical reviews) but still impressive to see a sub $150 optic hold up like that.

 

[cmert]

Can't speak to RS standards, but in the LE realm aimpoint is king and if you can't afford aimpoint, holosun is the next most common for both pistols and rifles.