I've finally got pics of all the cav carbine bayonet latch variations.
The first type was what is often called the "slider". That works as well as any name, I guess. It has a 'knob' on both sides which might be why the Italians called it "ambidexterous". I've messed around, and it works much better if you pull back on both sides at once. It didn't work so well when I tried to use only one.
This was not a sturdy arrangement and was phased out toward the end of WW1. You don't see them very often now.
The second pic shows the "slider" bayonet deployed.
The second style tried was a lever lock. The 3rd pic shows one in the locked position. 4th pic with the lever down against the stop is the released position. I've tried two of these, and neither one inspired much confidence. Apparently it didn't do much for the Italians, either as this type was replaced during refurb in the 30s. Not many of these are around, either.
I think I mentioned somewhere else the Italians wasted little. Pic #5 is another example of this. Lever lock bayonet hangers were converted to the common push button style. You can see the lever stop detents still in place while the lever stop lug at the bottom has been ground off. This is not uncommon and really not worth any premium.
Bottom pic is the common button style bayonet release. It's much better than the other two types!
But! The whole concept of a bayonet on a cav carbine just does not seem right. Especially if the opposition has a long rifle with long bayonet.

It does, however make a great monopod if shooting prone or from a berm!
For collecting purposes, go for a slider first - then a lever lock. SW