Hatsan flashpup qe trigger

Nothing on Brothers in Arms YouTube about flashpup qe triggers he’s working on the Quattro model. I’ll keep looking. In the meantime anyone know what the two set screws are for recessed in the oval hole on the underside of the flashpup qe stock? Thanks
1598634603_1440009075f493a6b5e9204.50194801.jpeg
1598634604_21267707395f493a6c21e213.60210013.jpeg