Here is another cool gift idea for gun enthusiasts. These My Mealivos 12 Gauge Shot Glasses let you drink from glasses that are modeled after 12-gauge shells. They each hold 2 ounces of your favorite drink. You can use the cap gun to open your drink and shoot caps.
These shotgun bullet glasses are great for Whiskey, Tequila, Vodka, Gin, and everything in between. More information is available here.