Found a good deal at the local shop on an 870 Rem yesterday. The only concern I have is that it has the magazine extention already installed, and it looks as though it barely hangs out past the end of the barrel. Say maybe a half inch or so. I looked at the Remington webpage and saw that some of their shotguns have this feature. My question is, is that safe to have the end of your magazine extention out past the barrel like that? Is there anything I should be prepared for before buying a weapon like this?