>You have to remember to close it after firing You actually don't (https://www.youtube.com/watch?v=YAneTFiz5WU&t=110s https://www.youtube.com/watch?v=YAneTFiz5

>You have to remember to close it after firing You actually don't (https://www.youtube.com/watch?v=YAneTFiz5WU&t=110s https://www.youtube.com/watch?v=YAneTFiz5WU&t=110s). The trick is that the bolt carrier itself seals the action so mud doesn't get into it; most other modern rifles eschew the dust cover entirely and just rely on this. It seems to work pretty well since they keep doing it.