I need your input.

[Palmaris]

Looks like tool mark, it starts as seen on picture and goes to the half way of barrel, following up rifling twist.
Is this tool mark or something else?

[Palmaris]

Run through X-Ray, couldn't see anything.

[plumbum]

I think it's a barrel, most likely from a gun or some kind...

Looks like a machine mark, seems parallel to the lands. Sure it'll still send them where they are supposed to go, but since you have an X-ray at your disposal, I assume you have higher expectations from your hardware than I do.

[Dano3467]

What kind of barrel is it, (manufacture)(make)

And are you pointing to a (what looks like) secondary land cut ?

What ever it is doesn't look quite right, but I'm not a gun smith.

Someone may know, but call maker to make sure if it bothers you.

[Palmaris]

It looks like scratch and it is follow upland pattern. This is barrel from CZ 75. I tolk to them and from picture (the same) they think it is tool mark. Because this thing doesn't go all the way to muzzle end, it doesn't really bother me. Still want to know other people opinion.

[VictorFranko]

It looks like the broach dragged a chip and scored the groove.

[[Variable]]

My gun has it too. Runs like a champ.

[crufflers]

Is this tool mark or something else?

You think it is a tool mark. CZ thinks it is a tool mark. Looking at the picture I can't see the line that clearly, but it looks like a tool mark. Probably a tool mark. If you are worried about it being a crack, try to magnify it clearly somehow.

[artb]

My gun has it too. Runs like a champ.

Looks good.

[Che762x39]

My gun has it too. Runs like a champ.

LMAO. I got coffee up my nose and a mess on the keyboard.

[code_blue]

My gun has it too. Runs like a champ.

Jeebus. Squib? Overcharge? What caliber was that?

[VictorFranko]

My gun has it too. Runs like a champ.

Too effen funny!

[Robert1234]

My gun has it too. Runs like a champ.

That should buff right out.

[bsg]

My gun has it too. Runs like a champ.

a tad of J-B Weld and she'll be up and running.

[SoCal1911]

What happened to your front sight on that S&W pictured?