They were the lowest, cheapest rings on the market when I used a couple of sets, but what drove me absolutely crazy was trying to get the crosshairs absolutely horizontal and vertical. Once you tightened down the clamping screws on the one side, the scope would cant in that direction unless you compensated for it trial and error. Never had an issue with the big slotted screws being on the right ejection side, but certainly not my preferred scope mount.
