I have a Ruger SFAR 20" 308 nearing the size of AR15 profile which I run with the gas block turned OFF for no semi-auto action, running it as a straight pull bolt action.....no action noise/movement til I want it, no brass in the air position tell, no searching for brass under deer stand, in weeds, slightly more muzzle velocity. Use it largely for deer hunting, plinking, ATV gun. Very reliable, under 1 MOA with a variety of factory ammo. Run numerous other AR10 platforms from several manufacturers (not all are interchangeable like Mil Spec AR15, as there is no AR10 mil spec) as straight pull bolt actions. Not busting down doors, clearing structures any more, prefer the bolt action control while still retaining the semi-auto option. Down side for the Ruger is there aren't other complete uppers that you can swap calibers. That's the benefit of other AR10 platforms being able to run numerus different calibers, like in the AR15 platform.So would a Ruger SFAR be a reliable AR-10 that is easy to upgrade? He'll mostly be doing some long range plinking and may take it to the deer woods. I'm pretty partial to Rugers myself.