GETTING MY KNIGHTS ARMAMENT SR-15 16 UPPER TO WORK

Two pushbutton (aka QD or snap-in) sling swivel attachments arrived with the SR-15E3 and you'll find ambidextrous holes to snap them into to the SOPMOD buttstock and at a few sites on all sides with the upper and reduce receivers.What other corporation can make a totally ambidextrous reduce with the AR? None which i'm aware of. What other firm feat