Quote:
Originally Posted by Medic
I suspect, it is because the C7A2 has a telescopic stock, unlike the M16A3.
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Their is a bit more than that
The C7A2 has a modified Weaver rail for mounting optics(Some people call this a Picatinny Rail however the rail on C7A1 and further models pre dates Picatinny rail MIL-STD-1913). Most C7A2 have the C79 Optical sight attached, however this can removed by the user and back up iron site can attached.
The C7A2 can also fire on semi-automatic and fully automatic VS semi-automatic and burst(three rounds) of the M16A2/3