In total, you have 30 Slots to fill with your weapons. Every weapon has its own slot count.
Sentinel 9 (5 slots) Edit
has low damage, but very good accuracy. Along with the Stallion, two of these pistols can be chosen and be duel-weilded. What the Sentinel lacks in damage it makes up for in clip size and reload speed, having one of the highest in the game.
Accuracy: Very Good
Firing Mode: Semiautomatic
Clip Size: 12 Bullets