Currently 3 different ARs are used, namely the H&K 53A3, Colt M-16A2 and M-4 carbine. The 53A3 looks similar to the MP5-A3, yet it adopts the more powerful 5.56 x 45mm assault rifle rounds. Nevertheless this AR suffers from high recoil and over penetrating power of the ammos.
The Colt AR-15 (M-16A2) is the standard AR used by the US armed forces. It fires the 5.56 x 45mm assault rifle rounds. The rifle is designed to fire in automatic and single fire modes. Due to its long barrel (51cm) it is not suitable for close quarter combats. Trijicon ACOG 4 x 32 scope is usually mounted on the upper of the AR-15, which effectively turns it into a tactical sniper rifle.
The Colt XM-177E2 carbine has an effective range of 600 meters, yet it only has a 37cm barrel and a retractable stock, making it suitable on close quarter combats and has the penetrating power of the 5.56 x 45mm rounds. Recently the SDU has purchased 72 M4A1 carbines from KAC.
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