It is fairly powerful, particularly on lower rounds. And in Origins, it is found in the trench between 115 Generators 1 and 3 and costs 750. It retains its 15-round magazine capacity, with 105 in reserve (120 rounds overall). In Buried, it is located on the right side of the gunsmith's wall. In Mob of the Dead, costing only 900 points instead of the usual 1000, it is found opposite one of the heads of Cerberus in the 'Broadway' cell block. In Die Rise, it is in the Trample Steam room. In TranZit, it is found on the ceiling of the Bus. In Nuketown Zombies, it is inside the green house. The B23R makes an appearance in every Zombies map excluding Bus Depot, Town, and Farm.
Compared to the KAP-40, the B23R has lower recoil and higher damage per second, should the player kill with one burst, and burst-fire can control ammo consumption. It is a popular sidearm in Hardcore game modes as it only needs up to two bullets to kill, making it excellent even for long range combat. Due to its high damage per second potential as well as fast aim down sight time, it is very effective in close quarters, though it loses effectiveness at range where the damage dropoff combined with the recoil and low magazine size offset its fire rate. Like the M8A1, it has no extra headshot multiplier, meaning it is recommended to aim at center mass to make the bullets count. It will kill in one burst at close range and two at a distance, assuming all bullets hit. It is a three-round burst pistol with a high rate of fire and moderate recoil, as well as a smaller burst delay compared to other guns. The B23R is the third pistol to be unlocked at level 19. This variant also has a different firing sound, which is noticeably lower than the sound of other firearms in the game. In the mission " Karma", if the player kills the guard who opens the weapons locker after searching for Chloe, he may drop a B23R with a semi-automatic firing function. It does not have any delay between bursts, unlike its multiplayer counterpart. The B23R can be selected in the customized loadout, and is also a part of the recommended loadout in " Achilles' Veil".