VERY NICE!!! Biggest thing I like seeing is the ram mount. I honestly didn't know they made a sidearm mount... Sheesh. They make every-damn thing!
I, too, am a bit concerned about the firearms ability to come out unscathed, even in a slow fall.... Thinking about what you said and where you showed the AR mount point, I think a hard case might be your best bet there. That would allow you to drill through the hard case and put a bracket on both sides: Inside the case for stability (probably just a flat bar which would act as something of a washer for the two bolts), and a custom bracket on the outside that would attach the case to the bike in whatever location you choose. If you're a little handy, have a grinder and a couple of other tools, and the time... You could make a damn fine mount.
2008 Versys - 37k miles
Givi - V35 Monokey Saddlebags - Large windscreen - Tail rack with v46 trunk
Speedy's - 1" Handlebar risers - Footpeg Lowering blocks
Osram 65W Bright replacements
... And the all important gremlin bell, courtesy of my wife.