What is long range? To me, it's 1,000yds.
My .308 BAR works fine in NRA High Power Sporting Rifle to 200yds, and shoots "minute of deer" beyond that, but I wouldn't consider it a long range target rifle.
Large capacity mag? Somebody out there could adapt it to an M14 magazine, but HOW MUCH MONEY DO YOU HAVE?
Yr. Obt. Svnt.
Your Most Humble & Obedient Servant
Fred J. Drumheller
NRA Golden Eagle