So far I've bought 3 aftermarket barrels. 2 Criterion and one Proof Research. All 3 shoot well, but I have issues with the Proof barrel. When I received it the first thing I did was clean it as I do all new barrels. Then I put the bore scope in and was SHOCKED. What I saw was a beautifully lapped bore that had pitting scattered through it. Of course I took pics and emailed Proof about it. First reply was I was seeing oil , not pitting. I emailed back and told them I was definitely looking at pitting and this isnt my first rodeo. They finally admitted they were pits but absolutely refused to take it back and replace it! I was told to shoot it and if it didn't shoot then get back with them. I was amazed at how flippant they were. I told them when I spend $600 I expect better. So, I will never buy another Proof barrel. Ever. The two Criterion barrels I bought from northlandshooterssupply.com seem nearly perfect and will shoot alongside anything I've seen for a fraction of the price.
Buyer beware.
Buyer beware.