Bearbong... Here is my complete AR RRA Varmint from ADCO... it is a 20", I consider myself a "beginner" in terms of AR and find them to be scarry in terms of accuracy (in a good way). A little heavy to carry around... I would go with what everyone else is saying... Free floated barrel and flat top, the free-floating in my opinion is the most important thing in getting good accuracy....

I used to finance my huntin' trips by goin' to a gunshow and buyin' a sound but beat up rifle, sprucin' it up, and fixin' it to shoot good then sellin' it at the next show. I don't know anything about the blackrifles, but it is possible to buy bargains at gun shows.