The M4 Carbine is a firearm soldat tracing its lineage back to the earlier carbine versions of the M16, battlefield all based on the original AR-15 made by ArmaLite. It is a shorter and lighter version of the M16A2, with 80% parts commonality with the M16A2. The M4A1 has selective call of duty fire options including semi-automatic and full-auto. It fires the 5.56x45mm NATO round, and is suitable for C.Q.C. Although CS the M4 has less effective range than the longer M16, many military analysts consider War Rock engagement with a non-specialized small arm above a range of 300 meters (330 yd) to be unnecessary. It is effective Crysis at ranges of 150 meters (160 yd) or less and has a maximum effective range of about 500 to 600 meters (550–660 yd).