Originally Posted By WS4LIF:
I have some top of the line upper receivers for sale.
First up is a BRAND NEW Colt M4 flat top upper receiver. This is the best on the market today. Completely Mil Spec, the original M4 feedramps, "M4" marked by the front/gas tube, T marks, etc! Has the famous "C" on the right side.
This upper is brand new, never fired on. Very rare to find these new any more. This will fit on any brand lower.
I'll take the Colt M4 upper