Funny thing happened when I was cleaning my .45

[The Annoyed Man]

Are the barrels CRS or drop forged?

You know... I don't really know. Would that make a difference? BTW, what is CRS?

[joe817]

Are the barrels CRS or drop forged?

You know... I don't really know. Would that make a difference? BTW, what is CRS?

CRS = Cold Rolled Steel

[Commander Cody]

Probably an optical illusion due to twist in grooves vs. light shine.

[gmckinl]

Are the barrels CRS or drop forged?

You know... I don't really know. Would that make a difference? BTW, what is CRS?

These days, CRS = Can't Remember Stuff

[The Annoyed Man]

Are the barrels CRS or drop forged?

You know... I don't really know. Would that make a difference? BTW, what is CRS?

CRS = Cold Rolled Steel

Thanks. You learn something new every day. As I've said in other threads, I'm no machinist, and I don't know all that much about different grades of metals or manufacturing techniques, or why one would be superior to another in a given application.

[stevie_d_64]

Springfield said the barrels are hammer-forged...

And of course they don't want me to put just any ole barrel, from just any ole stranger out there in the gun...

Like some have said, if it ain't broke, don't fix it...So I guess when I start missing things, I'll blame it on the barrel...Yeah, that'll work...

Can't even blow my reputation on purpose these days...Geesh, I must be slippin'...

[LedJedi]

it never fails me that every time i visit this site I learn something new....

[gigag04]

Our new G21SFs have "bar codes" that imprint on the round as it leaves the barrel. They were spec'ed this way so in an officer involved shooting people can tell who fired what, and where. They appear inside the rifling and sound similar to what you are describing.

[orionengnr]

tool marks for sure. With 2500 rounds through the gun I'm surprised they are still there. You never noticed them in the past? Have you been shooting FMJ or lead bullets mostly?

I am not a gunsmith or a metalurgist, but I have a serious question:

How can 2500 (or 25 million) rounds of a soft metal such as lead or copper remove machining marks from a hard metal such as carbon or stainless steel?

Hint: they cannot. This is why we use copper or brass bruhes in a steel bore.

Just as an experiment, take a brass brush or a copper Chore Boy pad and scrub a piece of steel as long as you like. You will wear out the brass brush/Chore Boy pad (and your arm). The steel will be unfazed.

[skub]

So, I can never wear out my barrel?

[gigag04]

Water is softer than stone - but it wore away the Grand Canyon.

Pics or it didn't happen...

[redlin67]

You have hot lead and burned powder going through the barrel. This will burnish the barrel no matter what type it is. In an annealed state, stainlesss steel is harder than carbon steel because of the high nickle content in stainless. Carbon steel can be heat treated and tempered to make it harder and more wear resistant, but there are always inconsistancies in the base metal. To see waves in the metal in nothing unusual and is nothing to be concerned about. What would make a difference is the diameter and concentricity of the bore. Minor wear should have little effect, but if it becomes extreme it would affect the velocity and accuracy of the bullit. I am not a metalurgist, but I am a machinist and I am a manager over a heat treat department.