One of the major issues with early versions of the M16 was that they used a different propellant for the ammunition than what it was designed with. This propell

One of the major issues with early versions of the M16 was that they used a different propellant for the ammunition than what it was designed with. This propellant caused increased fouling. They were also initially issued without cleaning kits, because they were apparently "self cleaning", which is patent bullshit.