I'd go 308 with a 16.5" barrel. Remington sps tac be a good un, but rare as hens teeth. Buddy in town had a new one last year that was missing some finish, i wasn't about to pay for a brand new gun that already looked used lol, but lot's of companies are pumping crap out like that now unfortunately. Just take whatever ya buy and have it cut down & threaded, that's what I'd do