WTB: 14.5 FSP Barrel or Barreled upper assembly & parts

[TropicLightning]

Looking for a 5.56 14.5 carbine gas length un-pinned barrel with Front Sight Post. Can either be an upper receiver with barrel or just the barrel. Prefer brands like Colt, BCM, etc.

Also looking for:

5.56 KAC QDC muzzle device kit.
AR15 M4 Upper receiver with M4 Feed ramps