Possible Clues:

• Shell-firing gun
• Field artillery item
• Question European in Ritz waving gun
• Artillery piece with zero problems
• Husband I wrote about possesses unknown sort of gun
• With zero, it would be a short gun for firing shells
• Gun with zero plastic
• One of the Big Guns with zero organisation
• Gun -- method it needs to get duck, but it's missing duck!
• With zero refurbishment, it's capable of setting parts of the world on fire