For those interested, this was the response from an HKCS armorer
"I got your email from Customer Service with the picture of your barrel. I am sorry to see that kind of finish on your barrel. To me it looks like the finish was either over heated or was covered too thick during the finishing process allowing it to bubble and/or "drip" as it cured..... "
As you would expect, their customer service is nothing but the best and they offered to replace the barrel at no charge if I wanted. Thanks to all who added their input