Law enforcement, shooting enthusiast. - Sightmark LoPro Green Laser Sight

I purchased the Sight Mark LoPro Green Laser Sight at a Gun Show new in box. The system looked good and the idea was sound. Got it home and read the directions and torqued the screw to directed foot pounds and the screw broke off both rail lugs before reaching 50% of the recommended ft lbs. Went back to the gun show at Chantilly VA and the vendor gave me a new one right there only in a different color, I needed black but they only had flat earth. Ok. Took this home went shooting, took sight off rail system of my Stag Arms M-4, to clean weapon and went to put sight back on and same thing happened at less than 15 lbs of torque with the screws. As you know if you have one, if the screws break you can't replace the screws as they break off in the scope portion where they would have to be drilled out. Not happy with the quality of the scope for mounting purpose. The green laser is adequate at best as can not be seen well outside in daytime but is adequate in night time vision. Easy to zero, but who cares if breaks at mounting process.