They still have the barrel nut, but it is a smooth one. Two options are available to you that I can think of:
1. There is a special barrel nut wrench for the smooth barrel nuts you can order from Sharpshooter Supply.
Here's the photo from his website:
2. You can use a pipe wrench on the smooth barrel nut and then replace the smooth nut you boogered-up with an older style (fluted) replacement barrel nut. The internal threads are the same on both styles of nut.
I hope this helps.
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