Aluminum Bufferless Stock Adapter Picatinny Rail End Cap and QR Hole, Silver [PSAP02-S]New Aluminum Bufferless Stock Adapter with Picatinny Rails and QR Hole, Silver. SKU PSAP02 S Replaces your buffer tube assembly with the ability to add a stock, directly to your AR 15 or AR 10 upper. For use with Uppers where everything is contained in the upper. Compatible with most folding Buttstock or Stabilizers. U. S. Patent Pending, Application Number 18385489 3 Slot Picatinny Rail Easy Tightening System Hole for QR Sling Swivel (sling swivel