KNIGHTS ARMAMENT SR-15 16 UPPER NO FURTHER A MYSTERY

Two pushbutton (aka QD or snap-in) sling swivel attachments arrived With all the SR-15E3 and there are actually ambidextrous holes to snap them into to the SOPMOD buttstock and at 3 destinations on each side of your upper and reduce receivers.As a result, During this latter situation an additional part has been placed inside the process that is def