Man I know they’re damn good. I’m trying to make an ultra small (maybe 5.5”) PDW AR like a rattler but not 2800.00JDS556762 I'll tell you something else too, those barrels are some of the most accurate you can get. They're badass barrels for sure. I have one currently that I need to send to ADCO to get pinned and welded with that B.E. Meyers M249!