.223 sucks in the wind, and more velocity makes it suck less. Go with all the barrel length you can tolerate. Barrel quality is more important than length for a precision AR, but given a choice longer is better.
Scope magnification requirements depend on both target size and range. 3x is plenty at 100 yards. How far away do you want to shoot PDs? A more important question is how you plan to deal with elevation. Will you hold over at 400 yards or dial your scope. Most LR shooters hear dial for elevation, and that would be my recommendation.
There are a zillion choices out there. Here's one.
http://swfa.com/SWFA-SS-3-15x42-Tact...pe-P62238.aspx





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