Which weapon is lightweight, air-cooled, gas-operated, magazine-fed and fires 5.56mm rounds with semi-automatic or three-round-burst capability?

• A. M9 9mm Barretta Pistol
• B. M203 Grenade Launcher
• C. M16-A4
• D. M84 Stun Grenade

Answer: (C)

Think of the rifle by its core features: lightweight, air-cooled, gas-operated, magazine-fed, chambered for 5.56 mm, with a fire selector that allows semi-automatic or three-round burst. That combination points to the M16 family, and in the option given, the M16-A4 fits precisely. It uses a gas-operated, air-cooled system with detachable magazines, fires 5.56 mm rounds, and its fire selector enables semi-automatic or burst fire. The other items don’t match this profile: a 9 mm pistol, a grenade launcher attachment, or a stun grenade is not a magazine-fed 5.56 mm rifle.