M16 Assault rifle

 The M16 Assault rifle, commonly known as the Armalite is the standard issue weapon of the Armed Forces of the Philippines or the AFP. This gun is also the united states' military version of the AR-15 rifle. It is capable of automatic, semi automatic or three-round burst firing. The assault rifle was used by the United States Army in the Vietnam War. Primarily it was utilized for the purpose of jungle warfare. Somehow, i believe that it wasn't really effective 

 due to the necessity to constantly clean its parts, if you are not able to do so, then, it will not work properly. Also during the Vietnam war in 1969 it became the US military standard service rifle replacing the M14 rifle in such role. Since the Vietnam war this gun has been the primary service rifle of the US Armed Forces. 
 My experience to this weapon was during my ROTC training. Me and my fellow Cadets were required to assemble and disassemble the rifle. It was a fun thing to do and fairly easy than what i expected. I'm looking forward to own this type of gun one day.

Weight	7.18 lb (3.26 kg) (unloaded) 8.79 lb (4.0 kg) (loaded)
Length	39.5 in (1,000 mm)
Barrel length	20 in (508 mm)
Cartridge	5.56×45mm NATO
Action	Gas-operated, rotating bolt (direct impingement)
Rate of fire	12–15 rounds/min sustained 45–60 rounds/min semi-automatic 700–950 rounds/min cyclic
Muzzle velocity	3,110 ft/s (948 m/s)[4]
Effective range	550 meters (point target) 800 meters (area target)[5]
Feed system	20-round box magazine: (0.211 lb [96 grams] empty / 0.738 lb [335 g] full) 30-round box magazine: (0.257 lb [117 g] empty / 1.06 lb [483 g] full) Beta C-Mag 100-round double-lobed drum: (2.2 lb [1 kg] empty / 4.81 lb [2.19 kg] full)