For you guys wanting pics and info re: the Optilock X-LOW one piece ringmounts, here's a partially assembled set. (not showing the plastic ring inserts).

I purchased these over a year ago from either Accuflite or TJ General Store... think for $120-$140. I still have the package which gives a height of 1.12" from bottom of the base to the horizontal split in the ring. Incidently, the package also shows this same height for Optilock LOWs as 1.20". If my math is correct that's only a difference .08" (less than 1/10th of an inch!)

When I bought the rings I followed DJ's (djpaintless) advice in an old post re: Optilocks.. and purchased the 2.5mm bit pictured from Brownells. It fits the Optilock ring screws perfectly and I haven't damaged the screws yet (knock on wood)...and have swapped them out 3 times, so far. Thanks DJ!

Good Luck... Rob

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Rob C