User blog comment:Postapocfan1999/Joel (The Last of Us) vs Bill (Left 4 dead 1)/@comment-4661256-20130716044743/@comment-10190509-20130717221830

Bulls12345, full auto weapons are more prone to jamming and overheating due to the full auto.

more gas expended causes the barrel to overheat.

The reason the M16a2 jammed so much is because it was still using a problematic gas operating system, if it got dirty, it could jam in a variety of ways (stovepiping, misfeed, double feed.

also keep in mind, the M4 was made AT THE SAME TIME as the M16a2, and used the sams gas operating system, both were also full auto until the M4a1 and M16a4.