Despite showcasing innovative features like duplex rounds, saboted flechettes, and caseless ammunition, none offered enough improvement over the M16A2 to justify the logistical overhaul needed.

A shortened variant of the M16A2 rifle, the M4 carbine provides the individual soldier operating in close quarters the capability to engage targets at extended range with accurate, lethal fire.

“The existing M16A2 rifles are heavy and with a barrel length of 20 inches. It makes it difficult for effective use by deputies in confined spaces,” the Sheriff’s Office said ...