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This barrel's m4 extensions have a ring that comes out past the barrel's chamber. It loops around most of the extension and under the chamber, like a helix.

I'm guessing this helix is a thread cut used to attach the barrel. My concern is that none of my other AR barrels have this exposed, rather large, possible thread. Seems like a good place to trap dirt and abnormal compared to my other barrels.

Do you guys think this is an issue of concern?



Thanks.

I don't see these marks as being harmful as long as everything measures out properly. If the chamber and barrel are in good order you should be fine.

R,
Bullseye

Thanks, BE. Like I said that cut looks like it's some sort of thread used to attach the extension, but I wanted to make sure it wasn't an issue before I put it on the upper.