The R-101C (Compact) Carbine is a Pilot anti-personnel fully automatic assault rifle that appears in Titanfall.
The R-101C Carbine is a medium range, automatic assault rifle. In the words of one of the developers, it's the "workhorse" of the game, usable in most situations that don't require an anti-titan weapon.
Although the R-101C is eclipsed in close combat by weapons such as the EVA-8 Shotgun and the R-97 Compact SMG, the weapon's predictable recoil and good rate of fire make it a competent weapon at all ranges and an excellent choice for any player. The iron sights on the R-101C are passable, but the unlockable sights may be more useful.