a. This section contains procedures for removing or installing the 40mm grenade launcher M203/M203A1 from the M16 series rifle and M4 series carbine. Unit maintenance is authorized to remove and install the M203 grenade launcher after initial installation. The M203 grenade launcher must be installed on the same weapon from which it was removed. The M203A1 may be removed but not reinstalled by the unit armorer. AIR FORCE PERSONNEL ONLY: The grenade launcher should be installed on the same rifle from which it was removed. However, there may be situations where this may not be possible.
b. Direct support maintenance will make the initial installation of both the M203 and M203A1 grenade Launchers. Since there is a torque requirement to the bracket clamp assembly screw of the M203A1, direct support must always perform installation of the M203A1. There is no maintenance requirement to put the M203A1 back on the same weapon.
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