The M249 is not a rifle - it is a light/general purpose machine gun, also commonly referred to as a SAW (Squad Automatic Weapon). Informally, it's sometimes referred to as the 'piglet'.
It means A rifle or a nickname The rifle is a AK-47
The M249 Squad Automatic Weapon fires the same 5.56x45mm cartridge used by the M16 and M4.
The maximum effective range of the M249 light machine gun is 1,000 yards (910 meters).
Not usually. Your weapon depends on the job you have. For example, a rifleman will carry an assault rifle such as the M16, whereas a support gunner will carry some sort of LMG such as the M249 SAW or the new M27
FN Herstal
CLP
Technically the PKM, since it is an AK-47 variant it fires a 7.62mm round while the M249 shoots a smaller 5.56mm round
700-1200 rpm.
In short the M249 is effective up to 1000 meters to cover an area target which the gun is designed to do.
The M27 is a variant of the HK416, adopted by the United States Marine Corps, and intended to serve in the squad level support role, as a stopgap measure between individual weapons such as the M16 and M4, and the M249.
360 FPS
Yes