At sometime in the pass someone got something stuck in the barrel to cause the bulge. Look at rib post #4 and you can see where it lifted up. This is not from the factory.
Can you shoot it, probably,, could something go wrong and it blow up, probably, would I shoot it,, probably not.. Look for another barrel, there out there.
Can you shoot it, probably,, could something go wrong and it blow up, probably, would I shoot it,, probably not.. Look for another barrel, there out there.