I have done much research into this topic and there are a couple different routes to go.
1. Get a TM M4, replace the outer and inner barrels and get a M16 For Grip (get the inner and outter barrels M16th Length). Remove the carry handle and put a replica(or real deal) Elcan Scope on it. Paint the Elcan, foregrip and slither stock OD Green and you have yourself a C7A2.
2. Get a TM M16A2, get a gaurder M16 Die Casting so that you have a flaptop with rails, mount an Elcan (real or replica) and you have a C7A1.
Thats pretty much the jist of it all.
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