Perhaps a DST was removed from the rifle and converted to single trigger also. They were available with a single trigger but this may not be a factory one. Hard for me to tell,,so little info available on them. A single trigger would be easier and less complicated to maniplulate for someone that has an ailment or disfigurement to the hand. Mannlicher New Models are nice rifles. What ever the bolt handle modifictions intent, it probably served it purpose and it didn't do any great damage to the rifle. Putting it back to factory condition wouldn't take much. Filling the hole(s) in the handle and blending the surface in. The trigger, if it is a conversion looks fine.
