Counter-sunk single-point, phillips-head could be an issue on the g2c rear sight mount installation. - ADE Advanced Optics RD3-009 1x Reflex Red Dot Sight w/Taurus PT111 G2, Millennium G2 Optic Mount Plate

The ADE RD3-006A1 GREEN DOT sight, itself, appeared fairly accurate and the overall installation was fairly easy in accordance with the provided instructions, including removal of the Picatinny mounting plate. The issues encountered came with: 1) Not holding zero: Upon checking that the Optic was securely in place, after installing the "anti-vibration shim between the EPS and the G2C mount plate (according to the instructions) the forward section of the sight still had a slight "left and right" movement once secured and torqued in place. This occurred even after even after the G2C plate (single-point) Phillips head mounting screw had been torqued to the required 12 in./lbs. Holding Zero under these circumstances is highly questionable. 2) Removing the device resulted, in difficulty in removing the pistol optic plate. The single point, counter-sunk Phillips head screw, almost started to "strip" during extraction. Care had to be exercised by every-so-slowly turning the screw to finally remove it. 3) The G2C mount plate was not a "press fit" or "snug fit" into the G2C rear sight mount. It appeared fairly loose! 4) Finally, the response as to why someone might see a "splashed dot, or Starburst was spot on!