AR help, please

[m25operator]

The simplest solution is to get a longer bayonet, I can't tell you where to get one, but it should be easy and less expensive than a new barrel, since your purchase is an H bar, the barrel is machined flat not tapered, and can take the gas blocks with bayonet lug, not in the original location. The triangular hand guards were not made for the carbine, so round or M4 is the game.

Get an original bayonet, and have a longer blade welded to it in a good profile, and you will have what you want, minus the triangular forend.

[1911 Junkie]

You wouldn't need a new upper, just a new barrel. If you get the right one, the front sight should switch over and you would also need a new gas tube.

If you want to go cheap and are dead set on the triangular hand guards, they do make them in carbine length. My buddy just picked up a pair at the last show we went to. The place that had them was Sherluck (they are from Ohio). I can't find their info right now but if you're interested let me know. They pretty much have everything you could want for a black gun and have always treated me well.