AFAIK to have a M16 convert to a C7....
C7A1 ->
Diemaco BackUp IronSight (BUIS)
Diemaco TRI-AD or CADEX Tri-Rail
Elcan C79A2
C7A2 ->
Four position carbine buffer tube with old generation Colt carbine stock (OD Green)
OD Green A2 pistol grip
OD Green A2 handguard
Ambi-Selector
Ambi-mag release
Extended Ambi-Charging handle
Diemaco BackUp IronSight (BUIS)
Diemaco TRI-AD or CADEX Tri-Rail
Elcan C79A2
C7A2 is harder to replicate completely, C7A1 might be the way to go.
Also don't limit yourself to AEG,
GBBR like WE M16A3 can be converted just as easily.
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