User blog comment:Postapocfan1999/Joel (The Last of Us) vs Bill (Left 4 dead 1)/@comment-4661256-20130716044743/@comment-180.190.136.119-20130716103254

The original M16 is the one prone to jamming. But the M16A2-A3 aren't that prone. The M16A4 which is one of the latest versions, has the ability to fire even when covered in dirt or mud because of its gas block and improved trigger. And it too has a picatanny tail for telescop/scope mounting