Fallout: New Vegas/Laconic

Post-apocalyptic Oblivion with guns and radiation in THE DESERT!

or

Average Joe/Jane gets shot in the head, hunts the person who shot them, and starts and ends a three-way turf war over Vegas.

or

Mailman nearly killed by MacGuffin mugger, later proves critical in power-struggle over the largely intact post-nuclear Mojave desert.

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