I shot my Mossberg 590 once, put 35 rounds through it.  Went to clean the gun today and noticed that when i took the barrel off and held it up to the light and looked through it, it appears that there was a small build up of something about halfway down.  It was in one spot, and looked about the size of a small button.  I cleaned it out and it appeared to have gotten better, but was still there. So i used my cleaning stick without any attachment on it to scrap at it a little bit and noticed that there were little silver shavings coming down the other end. You can still see a spot of discoloration in that area, but it no longer appears to be "raised" as it did before.  Due to its location being halfway down the barrel, i was not able to see it completely or feel it.

 

Is it possible that those little silver shavings were pieces of lead?  Perhaps one of the slugs that was shot through essentially melted onto the inside of the barrel?  Or was i scrapping away at the finish of the inside of the barrel due to a piece coming off while firing that then appeared to be something "on" the finish of the barrel, instead actually being a chip "in" the finish?  

 

It is the Marincote finished, BTW.

You probably had a spot of corrosion that picked up lead with each slug. Clean it the best you can and keep a film of high quality oil in the barrel

when stored. CorrosionX or One Shot HD-Extreme are what I use. Just keep an eye out for buildup in that area now that you know it's there!

If you ever needed to replace the barrel on this gun, can you?

Lead buildup in shotgun barrel is normal. Clean with brass brush on shotgun ramrod and solvent of choice. I use WD40, whibh actually works very nicely and is cheap.

 

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If you ever needed to replace the barrel on this gun, can you?

 

Sure, why couldn't you?

Sure, why couldn't you?

Well I only ask because on their site I don't see any 590 barrels, just 500.

Lead buildup in shotgun barrel is normal. Clean with brass brush on shotgun ramrod and solvent of choice. I use WD40, whibh actually works very nicely and is cheap.

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Is it common to not always be able to get all of it out?

Get a Big 45 Frontier Metal Cleaner and a good shotgun solvent and run it up and down the bore. If this is foreign material, it will take it right out.  If not you need to find out what is going on.

Just keep using that brush and keep spraying solvent. Also plastic from the wads melts onto the bore and is hard to get out. Elbow grease and WD40 will get it all out. Also helpful is wrapping a paper towel around a worn out brush to be a super absorbent patch to clean all of the loose stuff out. Spray wd40 in the bore and let it sit for a while and soak in. That stuff takes bumper stickers off, it will loosen the fouling lead and plastic up eventually. Also removing the barrel helps in cleaning. You can attack it from the breech side which is the end where it is the worst usually.

 

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Cool thanks. And yes, I did have the barrel removed while cleaning.