Nail Gun

 is a gun that fires a rapid stream of low damage nails.

Trivia

 * The Ammonomicon entry is a reference to the 1990s horror film Arachnophobia.
 * This weapon may also be a reference to Home Improvement: Power Tool Pursuit!, as the character in that game can also wield a nail gun, which shares the inaccuracy, fire rate, and base ineffectiveness.