EGW now makes a Beretta 92 mount with the RMR footprint, SKU 49552
EGW's Novak mounts will work on the BBR 3.10"
Unfortunately EGW does not make a version that will fit your pistol at this time.
Yes, the manufacturer lists the Heckler & Koch USP as a compatible model, and no generation distinction is noted, so it should fit an original Gen 1 USP40.
EGW SKU 49532 will fit a non optics ready CZ Shadow 2 and an optic with the RMR footprint.
Unfortunately, this mount will not fit a USP Elite. EGW does not currently make a mount that will fit one.
Unfortunately, EGW does not currently offer a mount for the Ruger P345
EGW mounts with the RMR footprint will fit the Trijicon RMR, SRO, Holosun 407/507C, Swampfox King Slayer, and other dots that call out using the RMR footprint. Please note that this mount is not compatible with an RMRcc
EGW SKU 49511 will fit a RIA 1911 A1 FS Tact and a dot with an RMR footprint.
You would need EGW SKU 49516 to mount an RMR to a Kimber with adjustable rear sights.