Millett is a quality brand. I believe you can trust their equipment. Not likely to shear their screws. Screw holes and screws should be cleaned with alcohol or acetone, blue or purple loctite applied, and torqued to 20-25 inch pounds for #6-48 screws or 25-30 inch pounds for #8-40 screws. If you had a gunsmith install it it should be fine.