How to make a modern D&D campaign?

Our group of 4 (sometimes more) have been on a pretty decent D&D session for a couple months now, and while it's fun, it's getting a little burnt out and the DM has stated that it may be coming to an end soon, leaving me next in line to DM. However, I'm not an enormous fan of mystical midevil... show more Our group of 4 (sometimes more) have been on a pretty decent D&D session for a couple months now, and while it's fun, it's getting a little burnt out and the DM has stated that it may be coming to an end soon, leaving me next in line to DM. However, I'm not an enormous fan of mystical midevil themes. I'd like to make a modern setting D&D game, maybe a modern war theme with guns, tanks, etc. How do I do this given the natural slow pace of the games? How would I enact an M-16 shot in a way that makes logical sense, and plays smooth? Wouldn't make sense to have players roll around the board in combat when the battlefield is all automatic weapons and such. Any ideas?
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