Magpul, Viking tactics, or Blue Force Gear sling (take your pick). HK sling clip to the rear receiver loop (w/Ferro Concept cover), and Magpul para clip with a Magpul loop (either M-Lok, or Pic rail) up front. Tried the PMM QD adaptors. They work well, just couldn't get comfortable with that tiny screw clamping them onto the rifle, especially the front one. The back one is fine, but that front one has a screw that looks more at home inside a PC, or a remote control car, than attaching hardware to a fighting rifle.