I'm guessing you want a side carry option. My best advice would be a butt stock adapter, available at one shot, for the rear, and a front sling plate for the front, although I can't suggest where to find one of those. Ditch the thought of using a 3 point sling, they're old tech and essentially obsolete, now being replaced with 2 point adjustable slings ( blue fore gear VCAS sling).