Here's my Bushy 20" barelled upper for your consideration. I've had it for about five years and as you can see, it's the pre-ban/no-ban configuration with bayonet lug and a screw on A2 birdcage flash hider. Upper is marked "FK" but barrel has no markings of any kind, is non-chromed, and seems to shoot M193 and M855 equally well. I haven't shot this upper much but can't speak for it's mileage as I bought it used. Front sight is marked "C99 (RI inside a circle) 2". The bore does show some corrosion or erosion in the throat area (something a cleaning patch wouldn't bring out) but the last time I shot this upper my daughter and I had no problem popping gallon jugs at 200M, for what that's worth.
This upper does not include the bolt, bolt carrier, or charging handle.
I'm selling this upper to help subsidize a 16" flat-top upper and would be happy to discuss trades for such an item. Asking $275 $235 or best offer and I'm located in the Louisville, KY area if anyones interested in a F2F transaction. Paypal + fees, or M.O.