cherokeetracker, The Nosler handgun features 3 front sling swivel stud holes for bipods, slings, ect. One rear sling swivel stud hole for a side mount or across the chest style sling.
One thing about the grips, there are a lot of aftermarket AR grips available.
I'm sure you're correct regarding additional calibers available in the future. For now, we've got enough to keep us busy for a while.