Most of those are pistols, which is a separate part of kit.

The end of that list shows the M4 carbine - which is an AR-15.

In popular vernacular, an “M4” is a shortened version of the “M16”, which is the military version of the “AR-15”. Armalite originated the design and Colt licensed it.

There’s a bit more to it than that, but that’s the high points.