Too bad you polished it. That may void warranty coverage for the barrel, depending on how much you did.

Armscor/Rock Island Armory made products all come with a limited lifetime warranty which covers the gun (whether with the original or a subsequent owner) till it just plain wears out (a very long time indeed).

If the problem you described continues after you’ve shot the gun a good deal more, contact Chief Gunsmith shawnarmscor.com to see what you can work out with him. Worst case = Armscor sells you a new barrel, if the barrel’s the problem. They’ll install the replacement barrel and function test the gun, fully reinstating the lifetime warranty.

Every day’s an adventure.