Samson Manufacturing Corp., Quick Release Mount for DeltaPoint Pro, 1/3 Co-witness, Black Tested return-to-zero quick release mechanism 6061-T6 Aluminum Quick release mechanism The Samson Quick Release Mount for Leupold DeltaPoint Pro enables you to achieve a lower 1/3 co-witness with your back up iron sights. This rugged mount is made of 6061-T6 aluminum with blackened stainless-steel hardware to withstand the elements. Although designed to fit standard M1913 Picatinny Rails, Samson's quick release mechanism is adjustable to fit other rails made outside this spec.