The Carbine Rifle is an available weapon The Saboteur. Utilized heavily by German Wehrmacht and Kreigsmarine riflemen, it can be used by both Sean and his Resistance allies. The rifle is very common and can be purchased for a low price on the black market.
Mauser Karabiner 98 Kurz
The Carbine Rifle appears to be the Mauser Kar98K, the standard-issue infantry rifle of the Wehrmacht during World War II. This would make sense, seeing as how it is a common rifle among the Nazi troopers in-game.
The Carbine Rifle is a bolt-action infantry rifle that uses a 5-round clip. It has a slow rate of fire, but is very accurate and powerful at longer ranges. It is excellent for medium- to long-range firefights, but for close-range engagements, a pistol, machine gun, or shotgun is recommended.
It is a unlocked after you unlock the black market. Many Wermacht soldiers also carry it. SS Sniper soldiers carry a scoped version of the Carbine.