No 4-40 screw is used. Anschutz has a screw M3X5 (3mm X 5mm) and what it calls a "threaded pin" M6X6 (6mm X 6mm).Yes Glen, 3mm cup head screw. The one with the adhesive adjacent is a 4-40 screw that prevents setscrew from backing out, shot one of these back in the 90’s.









