Its simplicity is also the source of its greatest weaknesses: the recessed chamber/narrow ejection port makes its occasional jams almost impossible to clear from the outside, requiring disassembly at the worst times..
It's a dandy little weapon for close in fighting in relatively clean environments...but the more-complex-to machine M-14s and FALs work more dependably in all environments, defeat all known body armor/light armor/cover and are effective at longer ranges.
Depends on how much you value your own life, I guess..
Yet, thousands of dead commies and taliban say otherwise.
The modern M4 is not your daddy's M16.