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AR15.COM
12/31/2008 12:33:27 PM EDT
I have located a barrel from Superior Barrels, this is the description:

20" Medium-heavy Lothar Walther made barrel in LW50 stainless steel. 1:8 twist rate. .223 Wylde chamber, match depth, match specifications. Specifically matched bolt to each barrel. 6:00 milled flat for windage adjustable front sight base. DCM/CMP legal. Perfect for 'ban states' and varmint rifles. Muzzle not threaded, and are not designed for threads.

I believe the threading caveat has to do with the way the crown is cut.  If it it would require cutting and re-crowning, would any port work be required?  I would like to keep barrel length as close as possible to 20".  Currently the port size is listed as .094

Here's a pic of the crown:

1/1/2009 6:00:44 AM EDT
[#1]
I am pretty sure it can be threaded.
1/1/2009 2:30:06 PM EDT
[#2]
No problem, and i doubt any port work would be needed as the crown is only .020 or so deep.