These are NOT Concari actions - again, more "expert" opinions . . .

I have a reply from Signor Rigido:

Quote [Dear Mr. Mehul Kamdar

The actions of my rifles are manufactured by in my company MR NEW SYSTEM ARMS, design of mauser k98, with variations depending on the size and demands of the hunter.
Do not use action of other manufacturers.
The actions made by his friend and colega Concari are excellent.
All manufacturers use magnum actions for cal. 500 Jeffery, while I use standard length actions.
For this look more like stubby.

Greetings friend

Marco Rigido] End Quote.