Posted: 7/16/2005 3:02:03 PM EDT
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Inside my USP .45 have some dark streaks that follow the rifling. They are very stubborn and only come off with a lot of scrubbing. Should I worry about them. I only shoot american eagle 230 gr FMJ throught it. It also happens on my USP .45 compact but not my Glocks. Also how often do you guys break down the slide and clean the extractor and firing pin? Thanks |
I break it down every time it gets cleaned. So much easier cleaning the barrel out of the slide. Just use solvent on a toothbrush on the breech face and around the extractor, then blow the solvent out w/ GunScrubber |
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Assuming you're not using lead based bullets, it's probably just powder residue that got caught up in the grooves. I have several USPs, and I shoot far crappier ammo then the kind you listed on a fairly regular basis. I wouldn't sweat it. As to pulling the extractor and firing pin, I have yet to do that on any of my USPs, and they are none the worse for wear. |
-1 I wouldn't suggest using any liquid around the breech face. It's not needed and can only serve to gum things up down the road. |
While that may be true with lubricant, you should use cleaner on the breech face to get the fouling off. When you are done, leave it dry (no lube). Common gun cleaners like Hoppe's 9 will not gum up the internals. These cleaners are kerosene based and evaporate in the firing pin channel anyway. |
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The best way to combat the carbon that builds up in those barrels is to clean them right away when your done shooting. When I had my USP, if I didn't clean the barrel right away and let it sit overnight, the rifling of the barrel near the chamber area would be caked with carbon that was very stubborn to get off. |
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Don't worry about it. What you are more than likely seeing is the bluing worn off the inside of the barrel. New, the inside of the barrel is blued just like the outside, and after just a few shots that bluing gets scrubbed off, leaving sort of a blue-gray streak. A lot of people new to HKs freak out over this. You can scrub until the cows some home, use every lead and copper remover on the market, and the only way you are going to get rid of those streaks is to wear off the rest of the bluing. If you run a brass brush though it 20 times soaked in MPRO-7 there will be no powder fouling left. When a patch of MPRO-7 comes out clean, there is no powder fouling left. If you run a patch soaked in CR-10 through it until a freshly soaked patch comes out without a trace of blue on it after 10 passes, that barrel is operating room clean, but you are still going to see those streaks. If they were lead streaks left over from shooting cast bullets, a patch soaked with MPRO-7 is going to come out with a gray color on it, I am sure you havn't shot cast bullets through your polygonal bore. |