Are M4 and M16 the same?

Another notable difference is the buttstock, where the M4 boasts a collapsable and adjustable buttstock, enhancing versatility and comfort, whereas the M16 has a fixed buttstock.

The gas systems of these two firearms also vary, with the M4 utilizing a carbine-length gas system, suited for close-quarters combat, and the M16 employing a rifle-length gas system, more suitable for longer-range engagements.

In terms of firing modes, modern M4s are typically full-auto capable, allowing for continuous fire, while M16s often incorporate a 3-round burst mechanism, offering a controlled burst of firepower.

The M4 and M16 are two distinct firearms with notable differences in their design specifications.

These variations in design reflect the different roles and operational requirements for which the M4 and M16 were developed.