Removing the muzzle device with a dremel is the easiest way I know. Here is a picture of a couple that I kept as examples. The one on the left was a hack job because I had no plans of saving it. The vortex on the right I was able to save. I re-built the removed material with JB and molly coated that area. I used it on my varmint rifle for a while and it held up fine. I also have a extended A2 that I removed, re-installed and re-welded. The trick is to make sure that the pin isn't too tight in the hole to start with, and dont penetrate too deeply with the weld.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin
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