I just bought a Security 9, i decided to clean it before shooting it. i took it apart and there is a grayish brown spot about halfway around inside the chamber more gray and very light brown. i can't see anything in the barrel and half of the chamber is good, but about half has this weird stuff in or on the bluing. it's not rough feeling and ammo cycles good by hand. taking a plastic nozzle straw from my rem oil i can't feel it catch on it so it has to be very thin or may be in the bluing but looks to be on top of it even tho it feels even with the bluing. My bronze bore brush won't clean it off, it has me stumped. i have oiled it and put everything back together and cycled it. and it cycles fine by hand. I am thinking it's part of the bluing that didn't take well but wanted to ask here in case anyone has had the same thing. thanks for any help on this.
Maybe brass scraping from a round. It is an odd color, almost like shipping lube, but you said it won;t clean out. Have you tried polishing the feed ramp to see if that takes it out. I had to send my Sec 9 back to Ruger because the barrel crown was way off center, causing rounds to miss poa by over a foot. Once it came back and tested ok, I traded it for another pistol. I am not real impressed with Ruger right now, as I have had to send back a few new guns from them. They did fix the issue, but these were problems that were obvious, visually. Wander how they made it out of the assembly line.
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Just to make sure before you send it back maybe you should try a couple different kinds of ammo and a different shooter.
Not trying to insult you just trying to cover all the bases before you pack it away in the mail.
If they test it with a different ammo and a different shooter they could send it back to you and tell you there's nothing wrong with it....
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It almost looks like a lamination in the metal. Maybe take the barrel to an automotive machine shop and have them Magnaflux it, or dye penetrant test it. OR easiest of all have Ruger replace the barrel.
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Well my problem was solved this morning, my nephew came by and offered to buy my security 9. I told him about the barrel and he said thats ok as he would use the return label and return it to ruger himself if I would sell it. So I asked him to make offer and he said $200 for the gun and 3 mags, I said sold and he got the gun. I went to my local shop a few hours later and took the holsters and 1 mag that i had got on the security deal from a friend. I bought a brand new G2c just like I carry and this one has a smooth black finish just like the one I carry, I was able to get it for $150.00 plus the 1 mag and the 2 holsters I had, they were Desantis dual carry 2 holsters. I am so glad I found a G2C with that smooth black finish again, most I find has a sandpaper feel. thought I would update, thanks.