Hmm. Okay well if it wasn't benched, I'll have to hold my tongue on the accuracy. The gas port surprises me. There Have been others here that made no change on a 12.5 that were having several problems, but, as you said, anther 1,000 will tell the tale.I'll get some barrel pics up tonight. I can't say for sure what the chop did for accuracy as it wasn't benched and shooting cheap ammo for plinking. When I get some time I'll bench it with good ammo and see. I can say this is perfectly acceptable to me for a 10.5" gun. Did not change gas port size, it's a standard profile barrel 3/4 at the gas block