The Springfield Armory M1A could turn me in to a competition target shooter.
I would buy an M1A with an 18.5" barrel chambered for .308 Win and a 5-round mag if it came in at under 7 pounds. Based upon my experiences chasing big game up-and-down high ridges of the Rockies while carrying heavy rifles, it would be the ultimate North American big game rifle.
BTW, the .308 Win, besides having a proven big game track record, is an anomaly cartridge. Carbine-length barrels do not affect its velocity to a significant degree.