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Posted: 1/22/2016 4:38:41 PM EDT
I took off the gas block and muzzle device of my modern sporting rifle as part of the install of a new handguard and noticed some strange bumps around the lip of the barrel. They are caked on pretty good, looks like powder residue. I don't want to damage the barrel trying to clean it off, I tried some solvent and a scouring pad, with little results. Any tips? Does it even matter?
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Quoted:
That doesn't look like carbon build up to me. Those bumps are part of the barrel. I very well could be wrong but i bet that barrel is hammer forged and those bumps are remnants of that process. The crown on the barrel looks good too. I want to see the inside the the muzzle device. It's possible it's erosion (or deposition). I don't think it's anything other than metal. OP, got a pic of that? And are you shooting suppressed? ETA, here's an A2 that I ended up cutting off.  DSC_5812 by FredMan, on Flickr
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Quoted:
I want to see the inside the the muzzle device. It's possible it's erosion (or deposition). I don't think it's anything other than metal. OP, got a pic of that? And are you shooting suppressed? Quoted:
Quoted:
That doesn't look like carbon build up to me. Those bumps are part of the barrel. I very well could be wrong but i bet that barrel is hammer forged and those bumps are remnants of that process. The crown on the barrel looks good too. I want to see the inside the the muzzle device. It's possible it's erosion (or deposition). I don't think it's anything other than metal. OP, got a pic of that? And are you shooting suppressed? I don't think the barrel had those bumps before, can't be sure. I've only 330 rounds through this barrel. I'm not shooting suppressed (wish I was) but I live in IL, thankfully not Chicago though. Attached are pics of the muzzle device. Looks pretty clean to me. 
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Quoted:
Its just carbon buildup, in a pattern based on the flow of gas inside the muzzle device. Just leave it... aggressive attempts to remove it might accidentally damage the crown. That seems most likely to me. I don't remember any bumps being there before, and I'm concerned about damaging the crown/ruining the accuracy of the barrel. |
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