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The wu barrel ext is longer.The threads are the same if I remember,but the wu has a 5/16 hole on the bottom.The barrel goes into the upper and a bolt goes from the bottom up into the 5/16 hole to lock it in.This was weird but thats how it goes.To make a barrel, a barrel ext (old one) and the bolt for headspacing and blank.You can probably play with the pistol gas tube and place it up close.Measure your stock gas tube vs ar15 gas tube.If they match then you can go pistol location and pistol gas tube.I can make you a 30/221.Send old barrel,bolt and blank you want to use.For gas location check you gas tube vs ar15.Easy job just a bit different.
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