I have a 16" midlength A3 upper (with BC/CH) ...
16" barrel (NOT 14.5) so the barrel is threaded and the F/H can be removed/changed.
It is a CavArms upper and has fat CavArms C6 hand guards (black)
The barrel is light under the handguards
It is marked 5.56 NATO 1/9 CMV
I want to trade for complete 16" A3 9mm upper (with BC/CH and mag block)
trade another 16" if you don't want a mid length.