[phridum]

I think if you want a 6.03 barrel because you don't want to have to care for the barrel EVER, you might as well stick with the stock barrel. To be fairly honest, getting crap inside the barrel isn't a regular occurance. Punch it before a session of firing or a game and you should be fine. If you take a dive a plant your muzzle in the mud or have reason to believe your jacked it up, punch it again, but don't let the fear of dirt destroying the barrel keep you from getting the most from your rifle.