Stir together the tequila, lime juice, orange juice and sugar until the sugar dissolves. Pour the mixture into a baking dish and freeze until hard, about 5 hours. Scrape the mixture with a fork to break it into small ice crystals.
Spread 2 tablespoons salt on a small plate. Moisten the rims of 4 large martini glasses with a lime wedge and invert onto the salt. Distribute the frozen margarita among the glasses, and then top each with half a beer. Garnish with a lime wedge and serve.
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