Still waiting to hear back from the machine shops on a threading quotes. If enough people want this i can order another 20 feet. I can get it through my work we generally order anywhere from 5,000 to 30,000lbs of bar, tubing, angle and channel a week. So I don't have to pay shipping and i get bulk discount.
For those wanting barrels a single overall length would make getting an exact machine quote easier. Is 24" the optimal length for most people? Also one of my biggest pet peeves with my metadyne barrels is all the extra threading. When i put my extensions on my barrel and look down the inside i can see rows of extra threads everywhere. These will have the minimal length of threading needed.