POF Mil-Spec 7075-T6 aircraft aluminum Anti-tilt Buffer Tube uses “carrier cradle” extensions to ensure that the carrier is always supported by the buffer tube, even when the bolt is forward.  This prevents carrier-tilt and premature wear on the buffer tube.  Thusly, the buffer-detent button doubles as a lock that stops the buffer tube from rotating and becoming loose under extreme operation conditions.  POF’s desiging also features three (3) extra drain holes for marine environments.