Nail Gun

The nail gun is the first weapon used by Kohta Hirano during the initial outbreak at Fujimi Academy. It is gas-powered and able to launch nails at a speed high enough to pierce a skull at moderately close range. Kohta makes a stock and sight for the nail gun to make it more like a rifle.

Overview
"The tip needs to be pressed down to set the safety off, which can make it a pain to use, but well, Kohta-chan took care of things." -Daisuke Sato