The $1,400 ((cult)) (M16A2) is a rifle made primarily of aluminum, steel, and polymer components. It operates using a gas-operated, rotating bolt mechanism, fed by a detachable magazine. The M16A2 differs from the original M16 by featuring a heavier barrel, adjustable rear sight, and a burst fire mode instead of full-auto. It also has improved ergonomics, including a redesigned grip and buttstock. In conclusion, the M16A2's enhancements make it more accurate, reliable, and user-friendly compared to the original M16, catering to modern military needs.