"It’s when they loosen and are exposed to the shear force of the slide cycling that they will break. "
As tangential info on the screw shearing issue, I found out something interesting. Many of the 6x48 fasteners used for red dots are manufactured in China, and are .003" undersized. That will effect thread engagement, and grip strength, and especially in polymer and aluminum, very failure prone. Those McMaster-Carr fasteners might be US production to the proper specs, and work properly.
I found out from someone I got a VQ Ruger upper from. Milled for a Burris FastFire, but the upper is aluminum with a steel tensioned barrel and breach face. Those .003 undersized screws strip out the threads in aluminum.
As tangential info on the screw shearing issue, I found out something interesting. Many of the 6x48 fasteners used for red dots are manufactured in China, and are .003" undersized. That will effect thread engagement, and grip strength, and especially in polymer and aluminum, very failure prone. Those McMaster-Carr fasteners might be US production to the proper specs, and work properly.
I found out from someone I got a VQ Ruger upper from. Milled for a Burris FastFire, but the upper is aluminum with a steel tensioned barrel and breach face. Those .003 undersized screws strip out the threads in aluminum.
