The LifeCard .22LR / .22WMR by Trailblazer Firearms is one-shot, folding handgun made to match the duration and width dimensions of a regular credit card (3.375″ × 2.125″) with a thickness of approximately 0.5 https://life-card-pistol053197.thunkblog.com/794710/overview-from-the-lifecard-credit-card-gun