Gun is approx 6 years old, it's a Walmart version black syn 390, heavy use.
About twice a season, or after a heavy rain - I will take the gun down and clean it.
Recently, I tried giving it the first full cleaning of the season and the barrel wouldn't come out with normal pulling.
It's always been a little tight, but it wouldn't budge. So I made some barrel blocks out of particle board, viced it up, and pulled/wiggled on the receiver. Nothing. Ultimately, I had to use a rubber mallet to tap on the pistol grip before it would break free. I cleaned the shotgun, and put some anti-seize on the barrel extension before inserting it. Had to stick the barrel down into cardboard and tap the butt of the gun with the mallet to get it to go in all the way. I guess this is the new normal.
My question is, would there be any benefit/possible pitfall to polishing the back of the barrel extension with a dremel tool?
I don't mind living with it as is. Any advice/experience is welcomed.