The M16A4 shares performance statistics on par with the preceding M16A2, itself an evolution of the Vietnam War-era M16A1. Muzzle velocity is approximately 3,110 feet per second. The weapon retains the widely accepted 5.56x45mm NATO standard cartridge through a 30-round capacity detachable box magazine (curved). Weight increases just one pound with a fully-loaded magazine, bringing the overall combat weight of the system to a manageable 8.5lbs. The M16A4 also retains the adjustable front and rear sighting installations allowing for an effective range of about 600 meters. Firing selections are limited to semi- and burst-mode capabilities with a standard safety issued as well (the M1A1 offered full-automatic fire). Like the M16A2, the M16A4 is a gas-operated, rotating bolt (direct impingement) weapon. An optional shoulder strap eases transport.
Despite several promising designs appearing to overtake the M16 line, all have fallen short of US military needs and budget requirements, meaning that the M16A4 should retain a viable presence in the American inventory (as well as its allies) for the foreseeable future.
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