Anyone ever seen this in the bore of a revolver?

[twaits]

Its very strange. Looks like cuts in the bore but it's only on the lands. Not the grooves.
I'm thinking this is a factory flaw. This is a Colt .22 revolver. Anyone ever seen anything like this?
What the heck caused it?

[ralph7]

looks like where a tool (carbide or tool steel) broke.
the reason it isn't in the grooves is because they are cut a little deeper, thus cleaning up that mark.
was done prior to the rifling operation, imho.

[porsche]

I have not seen that.

[flanman]

Trick photography?

[broknaxl]

That is just weird looking. It might be a good idea to find someone with a bore scope and get a good look at it. What model of Colt?? How does it shoot??

[tmd17]

Interesting. I will be watching to see if we get an expert opinion, but I am going with the broken bit angle! Broken BEFORE the rifling process, and this the lands not cleaned up. How accurate is the gun?

[threecharley]

ported barrel? lol

[Bisley]

Hello, twaits. How old is revolver? I have seen marks across the lands in older .22's with bores shot out from corrosive priming..but this doesn't look like that. I wonder if a chip got trapped in the teeth of the reamer? Sometimes rifle chambers have "chip gouges" caused by this.

[tomob1]

very odd. the marks are about 1/4" back from the muzzle (just guessing from what's in and out of focus).
looks like someone put a bore gauge in turned it.
what camera did you use? i have a nikon with macro and i don't think i could get that kind of detail.
tom

[twaits]

This is a Frontier Scout '62. Not mine and the owner has never fired it. The gun looks almost flawless except for this.
The camera I used is just a little $200 Canon digital (Powershot A3100 IS Image Stabilizer). I do all of my gun photography with this little camera now. It's a great camera.
The marks are about an inch or so down from the muzzle.