RE: best AR 15?
Bushmaster all the way. Varmiter with fluted barrel and free floated aluminum forearm will shoot 1/2" groups at 100 yds and 1.25" at 200 yds. I load my own w/ Sierra 69 gr #1380 match bullets and 24.5 grs of Varget. I also have a Bushmaster in the M4 with the Mini Y and 16" barrel. it shoots excellent as well. It could probaly shoot as well as the Varmiter except is has a Mark 4 CQ/t scope vs. a Springfield 4-14 Tactical on the Varmiter. Just my opinion. Good luck, they are all fun to shoot.