Here are the remains of a "guild gun" with double set triggers which is a hunting rig made from a Carcano. Gunsmiths in Austria did this sort of work after WW1 - mostly in the early 20s.
Those of you who lurk the auctions may have seen similar rigs made up from M.95 Steyrs. I have always wanted one of those but they bring too much for my cheep budget. A common alteration on those is the bolt knob having been filed to resemble an acorn. The old-time gunsmiths were true artisans!
The seller told me this one had a cracked receiver, and looking at the stock, I'd say a pressure spike happened. And how! Hopefully, the shooter came away with vision intact!
I told him to just keep that for a tomato stake & send me the parts.
The triggers work as they should - the rear 'sets' the front which is around 3 pounds with a very nice let off - quite an improvement over the standard Carcano trigger.
This must have been an early one - notice the extractor through the bolt lug. This feature was abandoned early on - around 1903.
Notice also how badly the stock is shattered. That must have been quite a ride.
In any case, you don't see these very often. Don't fall for the sniper rig story - the military had a FEW DST rigs, and Italian shooting clubs had more, but those were very fancy with a brass plaque on the stock. All of those are M91s - the guild guns are much shorter.
These are simply a unique variation you sometimes see and about which very little is in print. Until now!