Re: Best AR/Carbine Scope under 400?
If you are shooting under 400 yards why do you need a mil reticle?
You can pretty easily 'guestirange' targets and animals under 400 yards. Also if you know your ballistics, you can easily hold-over or come-up pretty quickly without doing the math commonly associated with the use of MilDot. Also MilDots are only effective at determining range if you know your target size.
I am suggesting this because one of my favorite hunting scopes is the Leupold VX III, 2.5-8 x36mm with Duplex reticle. I have 4 of them on my bolt guns (.223, .243, .308, .300 RSUAM Mountain Rifle, and also 2 in the Mark 4 illuminated on AR-10's.
They are light, short, compact, good light transmission and color clarity and priced right at $399 most everywhere.
The Mark 4's are much more expensive though.