D1151P picatinny dovetail is an exact fit for machining any component with a picatinny dovetail. It is customized using the standard D1151S. The product is designed by adding a huge spring and a longer travel on clamp body to manage machining of upper and lower receivers. D1151P is perfect for any and every machining of picatinny parts for AR-15's and AR-10's. It has dimensions of 1.5" x 1.0" x 1.0", removable locating pins and uses a 45° dovetail angle.