The LifeCard .22LR / .22WMR by Trailblazer Firearms is only one-shot, folding handgun made to match the length and width dimensions of a regular bank card (three.375″ × two.125″) by using a thickness of around 0.5 https://trailblazer-firearms-lif521964.onzeblog.com/43367258/overview-on-the-lifecard-bank-card-gun