I’ve found that some folks have managed to get two LCD Topgun lightguns working on their mame cabinets.
There is also a *massive* write-up about them here.
When I purchased two I had every intention of getting them both working together, but have never got it to happen. I was not using Smogs drivers, so we’ll have to see how it goes.
I’m pretty excited about playing two-player “Cabal” and “Operation Wolf”.