One thing I remember seeing is that you clean the barrel to get a lot of pieces and chunks out that would get embedded into the barrel, this is most likely to happen at first. And never clean it to the metal... after a bit of a break in it builds a layer so that it’s harder to cause problems.

I've also talked to someone who didn’t "break in" his gun and said he couldn’t get it to shoot at first, but it got better as he went. So I think that if you have a good quality gun/barrel it may need less/no break in. It’s not that some people don’t break in a gun, it’s that they don’t do it with as much cleaning and purpose as others.

I think maintenance is another thing though. Some people say not to clean as much as others... in the end I think it’s a personal preference and down the line when something goes wrong, do you want to have to ask yourself "did this happen because I didn’t clean it as often as I should of?"