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 chromelined
Great condition, approx 500rds thru it
$460 shipped lower 48