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Very interesting. What's the
downside of using the DD mount, vs. milling the slide? From this vantage point it seems easier, cheaper, and just as functional.
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The only downside is that compared to my Unity Tactical or Glock MOS setups, the optic sits higher. It's not really that big a deal, but if you have multiple pistol RDS setups, it takes a little getting used to going back and forth between a milled slide and the RBU.
Practically Tactical on YouTube has a good video on the RBU, and they did a torture test video of it as well, which should be releasing soon; I think their videos got sidetracked by SHOT show.
.......and as for the BUIS on this setup - I'm hitting man-sized steel at 25-30 yards with just the BUIS. The short sight radius isn't a problem at all.
I think the coolest thing about the RBU, is that you can add an RMR with BUIS to ANY Glock, for about $130 and 5 minutes of work.
I plan on getting a Glock 21 Gen 4 and adding a Leupold DeltaPoint Pro to it, when Dueck Defense releases the DeltaPoint RBU mount.