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So forgive me if this has been asked before, I searched the forum but you wouldn't guess how often the terms "remington 870" and "magazine extension" come up. 
I have a newer Remington 870 Express (bought 04/09, not sure on when it was actually manufactured though) and have been considering putting an 8-shot magazine extension on it. But I seem to remember hearing something about having to file down a couple little detents in the existing magazine tube to get it to work. Can you guys confirm this?
If I do, does anybody have something they can show me that details how? Also, does making this modification mean that I would no longer be able to remove the extension and put on my stock magazine cap with a limiter for when I want to go dove/quail hunting?
I have a newer Remington 870 Express (bought 04/09, not sure on when it was actually manufactured though) and have been considering putting an 8-shot magazine extension on it. But I seem to remember hearing something about having to file down a couple little detents in the existing magazine tube to get it to work. Can you guys confirm this?
If I do, does anybody have something they can show me that details how? Also, does making this modification mean that I would no longer be able to remove the extension and put on my stock magazine cap with a limiter for when I want to go dove/quail hunting?