On the SB brace adapter that installs on the rear of the EVO 3 S1, there is a screw hole for a grub screw to help secure the brace assembly from moving off the gun. I wanted to use that threaded hole to mount a Magpul QD swivel mount there however I do not know if the thread of the screw supplied with the QD mount is the same as the SB brace hole. Does anyone know the thread size of that hole?
I don’t want to use the plastic mount surface on the receiver for fear of breaking it and this option seems to be one no one has explored.
