It's a French Model 1916 carbine, sometimes called a Lebel, probably more correctly called a Berthier. Caliber is 8x50R Lebel. Magazine is a Mannlicher type. It takes a special clip to function as a repeater. Either the 3-shot or the 5-shot clips will work.

Most French rifles of that vintage are pretty beat up. That one must have escaped most of the abuse.