In campaign on Infernal Mode, Keith can find this weapon during Episode 9-1. It has capacity of 28 rounds and maximum 80 spare rounds. Also, this weapon can be obtained after scanning all 30 hidden handprints, so it can be used in Episode 12-2 against Ultimate Abyss and after that it can be used in further completion of game if playing "New Game+".
In Raid Mode, the stats are generally the same as in the Campaign but varies depending on the player's level. It is found rarely in the store, usually with a very fast rate of fire and a high capacity.