The M203A2 attaches to M16A4 rifles and M4/M4A1 carbines equipped with either the M5 or M4 Adapter
There are remaining old style receivers which require the old style trigger pin. All configurations require the new firing pin.
There is a new front mounting bracket for the M203A1. The new mounting bracket assembly has a bracket clamp assembly and the tang has been removed.
There is a quick release bracket used to attach the M203A2. This bracket is a semi-permanent installation to the M203A2.
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