There are a selection of AR / M16 ammo types. The 5.56×45 at top and bottom, the 7.62×51 (.308) second from top, 6.8 SPR and 9mm below that. From a few feet away they look pretty much the same, as you look more closely the differences are apparent in the magazines. Their stocks are all [...]

The M4 Carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16, all based on the original AR-15 made by ArmaLite. It is a shorter and lighter version of the M16A2 assault rifle, achieving 80% parts commonality with the M16A2. The M4 has selective fire options including semi-automatic [...]

Mission
Deter and, if necessary, compel adversaries by enabling individuals and small units to engage targets with accurate, lethal, direct fire.
History
The M14 was the U.S. Army’s original choice to replace World War II era M-1 and Browning Automatic rifles. The M14 was an unhappy compromise weapon, that satisfied virtually no one, least of all the men [...]