This is a Hera USA Stock known as the HRS CCS, model 12-35.
Hera Arms CCS Collapsible Stock. Hera Arms CCS stock is a superb upgrade to your AR rifle. Designed to work with your mil-spec carbine buffer tube this retractable stock has an easy to use push button release and a snug fit to the tube.
Features:
Collapsible
Mil-spec