As you only paid $40 it would be worth the money to find a junker with a bad bore or else buy the missing parts.
The really rare variation is the Model 1902 Indo-China rifle, interesting that some of these came back to the USAfrom Viet Nam veterans
The Mann Berthier was never used as a scope mounted sniper nor as a grenade launcher rifle. Only the Lebel was used as a sniperAttachment 88193Attachment 88194Attachment 88195