Related Clues:

• Guns' partner
• Snowballs, at times
• 'Bullets'
• Barrel filler
• Peas, for pea shooters
• Munitions, slangily
• Firing range rounds
• It's effective only when fired
• Magazine pieces?
• Arms
• Second Amendment issue
• Saluters' needs
• What some chambers hold
• Armory holdings
• Stuff in a barrel?