M16

       The M-16 is a selective fire adaptation of AR-15 used by US military, it can be adopted to use semi-auto and fully-auto firing modes. 

       The M-16 is a light weight, air cooled, gas operated, magazine feed, with rotated bolt, which is actuated by direct gas impingment, It uses 5.56 x 45 mm NATO bullet, and is made of steel, 7075 aluminium alloy, composite fibers and polymer materials. 

M-16A1

 The M-16 rifle was first deployed in jungle warfare operations in south Vietnam, but became standard service rifle of Vietnam war by 1969, replacing M-14 rifle. It is also used my many other militaries all around the world, this makes it the most mass produced weapon of its caliber. 

M-16 A2

       The M-16a2 was developed on the request of USMC, with a few modifications to M-16a1, In M-16a2 the selective fire was changed to semi-auto and three round brust fire mode, an adjustable rear sight, heavier barrel, case deflector for left hand shooters, and cylindrical hand guard. The M-16a2 is still in stock and is used by air-force and some times USMC. 

M-16 A3

      The M-16a3 looks exactly like M-16a2 except its fire control mechanism is back to M-16a1 (semi-auto and fully-auto) selective fires, the M-16a3 is employed only by the Navy and cost guard. 

M-16 A4

     The M-16a4 became the standard weapon for USMC in 2004. it is a flat top receiver, hand-guard with 4 picatanny rails for mounting a sight, lazer, night vision device, M203 grenade launcher, fore grip, removable handle or a flash light. 

     The M-16 gives 12-16 rounds/min in sustained firing, 45-60 rounds/min in semi-auto firing, and 700-950 rounds/min in cyclic shooting. Having muzzle velocity of 3110 ft/s the M-16 can achieve the effective range of 580 m for point target and 820 m for area targets. 

   There are 3 feeding magazines avalable 20 round, 30 round, and a C-mag 100 round double lobed drum.