varminthunter
Well-Known Member
To begin this, I recently purchased a new AR15 upper. This is a 24" SS Bull barrel with a 1:8 twist. I cleaned the barrel before shooting and when through the normal shot-clean for the first 25 rounds and then after every 25 rounds. I have fired almost 150 rounds through this barrel and so far the best accuracy I have seen is a 3" group at 100 yards. I have tried 55gr, 62gr and 75gr rounds, all producing approx. the same results give or take a 1/2" +-. These round have been everything from FMJ, Soft Point and Hollow Point rounds.
I ran my borescope down the barrel and to me it looks like rust spots all up and down the barrel, but I'm not 100% sure. What are your opinions of the attached borescope images. Some of this maybe copper fouling, so I think I will pickup some cleaner for this to clean the barrel.
I should mention that I purchased this upper through M&A Parts Inc.
I ran my borescope down the barrel and to me it looks like rust spots all up and down the barrel, but I'm not 100% sure. What are your opinions of the attached borescope images. Some of this maybe copper fouling, so I think I will pickup some cleaner for this to clean the barrel.
I should mention that I purchased this upper through M&A Parts Inc.