AU Gun/zh

 is a gun.

Trivia

 * This gun is a reference to the James Bond movie The Man with the Golden Gun.
 * "Some Assembly Required" refers to the fact that in the film, the gun can be disassembled into a series of golden innocuous looking items: a fountain pen (the barrel), a cigarette lighter (breech), cuff-link (trigger), and a cigarette case (the grip).
 * Au is the chemical symbol for gold.
 * The 22 ammo count is likely a reference to 22 karat gold known as "Crown Gold". The exception to this is the Pilot whose bonus increases the gun's ammo by 10% to 24, which would reference 24 karat or "Pure Gold".