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Posted: 10/2/2012 8:03:57 AM EDT
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Hey folks,
This is my first post here. I have had mt AR-15 (also my first ever firearm) for a little over a year now. I noticed last week after cleaning my AR that there are some gouges or rough marks in the barrel towards the muzzle end. I searched up and down Google for other people with this problem and found only a single topic that described the same thing I see - and sure enough, it's on ar15.com! The original topic is from 2007 and is on the archive server located here. Before someone mentions it, it is NOT carbon or copper fouling. I cleaned and cleaned and cleaned to make sure it was not. I de-coppered with some Barne's CR-10 and ran wet and dry patches with Froglube until the bore was spotless. What I can tell, it was not something caused by cleaning. I use a single piece, plastic coated bore rod and a plastic loop-type jig and copper brush. I am particular about keeping my firearms clean and lubricated. There was never rust in the bore to cause pitting. I imagine that it left the factory like this. I never paid super close attention to looking down the bore - just make sure that it looks shiny and clean. This time I must have hit it at the right angle to see these spots. Should I be concerned about this? The topic I linked to above seems to have come to the conclusion that it is a non-issue. I just want to make sure as I am freaking out over it. None of my other firearms have anything like this. As far as the AR in question - It's a Stag Arms 2T, with a 1:7 twist HP/MP chrome lined 16" barrel. Interesting that the person who complained about it in the above post also had a Stag Arms. |
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How is your accuracy? Does it get better or worse when your bore gets fouled a little?
Muzzle erosion is a reality not many understand. Once the bullet leaves the barrel, the pressure inside the barrel accelerates the burning powder particles at extraordinary high speeds because they have such little mass and many of those particles are quite hard at varying points in their transitions, so they will take tiny parts of your barrel with them. Its like a miniature sandblasting of your muzzle's bore every time you fire. |
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I haven't payed close attention to the accuracy the last time out. I will be going out this weekend now that I know of the problem and will be watching accuracy closely and to see if the erosion or whatever it may be gets any worse at the cleaning.
I understand that there will be erosion with use but it's weird that it's in a specific location on one land and on groove only. I also figured that these would have had to be pretty large chunks (relatively) to be worn away by this process. I know it is not the gas hole or the reflection of the gas hole. 100% positive on that one. I should have mentioned earlier that I have about 1500 rounds through this AR and it was bought brand new. |
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