Perfect after installing a delrin shim - Burris SpeedBead Mounts

I was excited about adding a red dot to my Winchester sx3. I ordered the SpeedBead and followed the simple installation instructions. I was very disappointed because I raised the sight as high as the adjustment would allow but the "dot" was still pointing very low (contacting the rib about halfway to the front of the gun). I was about to remove the SpeedBead and look for another option. Then I found the UM TACTICAL Delrin Shim 1.0 Degree for Vortex Venom & Viper, Burris Fastfire II, III. I purchased this shim and 5 minutes after install the red dot was zeroed and functioning flawlessly.
The need to add a shim is a minor annoyance. I love this SpeedBead option.