Trailblazer Firearms LifeCard 22 WMR (22 Mag) 2.5in Brown Aluminum Pistol - 1 Round - Back by popular demand, LifeCard 22 WMR. A folding, single-shot .22 caliber pistol that's no bigger than a stack of credit cards. At .5 inches thin and weighing less than 7 ounces, the Trailerblazer LifeCard will be the last gun you'll leave behind. This .22 caliber single action LifeCard pistol made in the USA by Trailblazer Firearms. Made of aluminum and steel with a corrosion resistant finish.