THE KNIGHTS ARMAMENT SR-15 CQB 11.5 UPPER DIARIES

Two pushbutton (aka QD or snap-in) sling swivel attachments came with the SR-15E3 and there are ambidextrous holes to snap them into about the SOPMOD buttstock and at 3 destinations on all sides from the upper and lower receivers.An additional unique attribute is the use of two entire-size extractor springs in place of the traditional micro spring.