I agree with the Leupold Mark AR recommendation.
My Mini-14 (Davidson's "Deluxe" version) wears the Mark AR 1-4X. It performs very well.
My Armalite "M15" has the Mark AR in 3-9X. This scope has the trajectory-compensating feature, and the turret is made for "55 grains/3100 fps". It happens that my handloaded rounds fire a 55-grain bullet at the average speed of 3097fps....pretty close, I'd say.
With the rifle zeroed at 200 yards and the turret scale set to read "2", setting it at "4" yields dead-center impacts at 400 yards---just as advertised.
Optics on both scopes are fine, adjustments are accurate, and general performance is worthy of the brand name (I have about a dozen other Leupolds, so I suppose I'm a satisfied customer.)