The 2.7mm Kolibri is an Austrian-Hungarian semi-automatic pistol produced in 1914 and was widely known to fire the world's smallest pistol cartridge available.
The Kolibri is the smallest weapon in Arsenal. It is a three-shot kill to both the body and the head. It also has perfect accuracy due to not having spread, meaning whenever the crosshair is pointed, the Kolibri will guarantee hit it. It also has no fall-off, making it exceptional at long range compared to other pistols.
However, the main drawbacks of the Kolibri are its small magazine size and a somewhat long reload time of 3.5 seconds. This does not pair well with its insanely-fast fire rate, which can expend its ammo in mere seconds.