I have one flat top m16 upper that is still available.
All parts included except barrel and front site/gas tube block.
It has CAR length handguards, Complete M16 bolt, carrier, removeable front site, AR threaded AK-74 brake, charging handle, barrel nut, delta ring etc.
It came off my M16 a Bushmaster Rifle just e-mail me and I will send you a pic. This the perfect set up to build up a 16" or shorter upper.
I am a lefty and no longer needed this stuff after I converted my uppers to L/H all parts are in like new condition with black finish.