That's the Raptor Engineering mount? (ETA: Yep, revolver_ph is their forum handle.) I found mine just yesterday. (Misplaced as it arrived just as I was headed out for a long weekend kayak fishing in TN.... Actually bream fishing from a kayak. Jolly jokers!)
And discovered as well the FastFire II is happily mounted on a long running Govn't Model project, so went a-shopping. Only to be thrown completely off track by an "old" RSR 657 ".41 Magnum Hunter", which is now on lay back.
Anyway, the new mount does seem nicer than the "does-all" Allchin mount with it's two movable (and easily losable) nylon locating pins. The R. E. mount is specifically for the FastFires, so there are four integral locating pins sculpted from the 6061 aluminum alloy. The "looky-looes" may notice some milling marks, but they're mostly on the underside and won't show when installed. Only thing that I would have done differently would be to use a 7050 or 7075 alloy for thread and pin shear strength. (As well as being somewhat nicer to mill, being less "gummy".) Helicoils don't seem practical here. But probably not an issue, especially with the FastFire III and it's top loading battery.
Can't see or load photos right now on the pirated wifi, may get some done for next week.