Quote:
Originally Posted by bigedp51
Get some foam bore cleaner and see if these dark areas disappear from the bore and chamber. I have read postings in the last few weeks where Russian steel case ammo was causing corrosion when the ammo was marked non-corrosive.
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Do NOT use foaming bore cleaner in the AR 15 platform. The stuff stays sticky, and will cause issues with the gas port.
The modern Russian ammo is not corrosive today, and has not been for several years.
When the rifle is shipped, it has oil in it, which is applied after test firing. In general, you are going to see some dark patches for a short while, it is normal. If you use a copper cutting cleaner, you will see serious green/ blue & black on your patches if there is much copper present. The cleaner changes color and is an indicator that there is copper present.
Remember; just because you see a little color on a patch does not mean you have 'Copper fouling' in your barrel. The real test for this is going to boil down to accuracy tests/ grouping. While it is desirable, a gin clear patch is not the end all, be all for rifle cleanliness and proper function.
Frog lube tends to collect tons of goop, crud and powder in AR 15's. I tried it, and switched back to Slip, and similar light oils. They run much, much cleaner thru the shooting I do.