Two pushbutton (aka QD or snap-in) sling swivel attachments arrived with the SR-15E3 and there are ambidextrous holes to snap them into about the SOPMOD buttstock and at 3 places on all sides of the upper and lessen receivers.KAC utilizes a hammer-forging procedure on their own 5.56x45mm barrels and chambers, which boosts the standard of the interi