Mauser made ~1 million semi-auto C96, only first 20 thousands had this feature (hammer releasable while bolt is open!). So, 2%. It won't work on small ring, the trigger is disconnected from the sear when the bolt is more than 1m/m away from the breech. Thanks to the "rocker plunger".
But if it's an very early gun, CH, transitional LRH (those two were classified by ATF as pre-1899 antique, no FFL required for transferring), and Italian Navy delivered in 1899. That's about it.
More pratical way is cut a notch on bolt bulge. But that messes up the gun. Find a replacement bolt and rework it.
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