Most all AR15 barrels I have used (mostly from Ballistic Advantage) on the threaded end are basically flat around the bore. One Ballistic Advantage Barrel I have is an 18 inch "SPR" barrel, it differs slightly from the other 16 inch M4 type profile barrels I have, the Extension is Nickel Boron coated, and there is a slightly inverted crown, sort or like the crown on a bolt action target barrel's crown.
I was removing the flash hider (basic A2 type) and noticed the "crown" was all lumpy and bumpy looking. Putting a little M-Pro 7 bore cleaner gel on the tip, I let it sit a few minutes and wiped it off. This only removed the black residue from the lumpy surface, but the lumpy material is grey and appears to be lead. Maybe I never noticed this changing barrels and flash hiders before, but I sure don't remember seeing this before.
I know on a Bolt action rifle with a target crown especially, and most crowns in general this is a bad thing accuracy wise. This particular AR is set up like a SPR type gun, so accuracy is important with it more so than my basic carbines.
Is this like a target crown concerning accuracy, and if so how and what is the best method of removal?
Thanks for any and all info here, much appreciated!
Russellc
I was removing the flash hider (basic A2 type) and noticed the "crown" was all lumpy and bumpy looking. Putting a little M-Pro 7 bore cleaner gel on the tip, I let it sit a few minutes and wiped it off. This only removed the black residue from the lumpy surface, but the lumpy material is grey and appears to be lead. Maybe I never noticed this changing barrels and flash hiders before, but I sure don't remember seeing this before.
I know on a Bolt action rifle with a target crown especially, and most crowns in general this is a bad thing accuracy wise. This particular AR is set up like a SPR type gun, so accuracy is important with it more so than my basic carbines.
Is this like a target crown concerning accuracy, and if so how and what is the best method of removal?
Thanks for any and all info here, much appreciated!
Russellc