9mm

9mm (Yellow bullets. Very short distance) Its just the faster thing to find :D

9mm WEAPONS
M9 (Pistol of all your time)

Glock 18C (Like the M9 but the reload time is more faster)

MP5 (Reload time its not very bad)

Instram Mac-10 (Reload time goes to the faster time of all)

UMP9 (Semi-automatic SMG. Accurate and Steady)