The following specifications describe which rifle: lightweight, magazine fed, air-cooled, gas operated, firing in semi-automatic or 3-round burst of 5.56mm, with a 30-round magazine, max effective range 550 m (point) / 800 m (area), max range 3,600 m, length 39.63 inches, weight 8.79 lb with 30-round magazine, rate of fire 90 rounds per minute (burst) / 15 rounds per minute (semi), and equipped with PEQ2 IR laser, RCO optics system, and M203 40mm grenade launcher?

The following specifications describe which rifle: lightweight, magazine fed, air-cooled, gas operated, firing in semi-automatic or 3-round burst of 5.56mm, with a 30-round magazine, max effective range 550 m (point) / 800 m (area), max range 3,600 m, length 39.63 inches, weight 8.79 lb with 30-round magazine, rate of fire 90 rounds per minute (burst) / 15 rounds per minute (semi), and equipped with PEQ2 IR laser, RCO optics system, and M203 40mm grenade launcher?

• A. M16
• B. M16 variation for MOUT
• C. M4 Carbine
• D. M16-A4

Answer: (D)

This description fits the M16-A4. The combination of a lightweight 5.56×45mm, magazine-fed, air-cooled, gas-operated rifle capable of semi-auto or 3-round burst, with a 30-round magazine, and an overall length around 39.6 inches and weight near 8.8 pounds, matches the full-length M16 family after updates. The M16-A4 adds a flat-top upper with rails to mount optics and accessories, and it is commonly configured to accept an M203 40mm grenade launcher and optics like the Rifle Combat Optic, along with a PEQ-2 infrared laser. The stated maximum ranges and fire rates align with the M16-A4’s documented performance. Shorter variants like the M4 Carbine would be lighter and shorter, and older M16 variants typically lack the flat-top rail and modern accessory setup described.

This description fits the M16-A4. The combination of a lightweight 5.56×45mm, magazine-fed, air-cooled, gas-operated rifle capable of semi-auto or 3-round burst, with a 30-round magazine, and an overall length around 39.6 inches and weight near 8.8 pounds, matches the full-length M16 family after updates. The M16-A4 adds a flat-top upper with rails to mount optics and accessories, and it is commonly configured to accept an M203 40mm grenade launcher and optics like the Rifle Combat Optic, along with a PEQ-2 infrared laser. The stated maximum ranges and fire rates align with the M16-A4’s documented performance. Shorter variants like the M4 Carbine would be lighter and shorter, and older M16 variants typically lack the flat-top rail and modern accessory setup described.