The North American Arms (NAA) Sentinel is a compact, single-action revolver designed for deep concealment and personal defense. Chambered in .22 Winchester Magnum Rimfire (WMR), it features a 1.425" barrel and a five-shot capacity. The Sentinel's swing-out cylinder allows for quick and convenient reloading, a notable improvement over traditional designs that require cylinder removal for reloading. Constructed from durable 17-4 stainless steel, the revolver measures 4.9" in length, 2.8" in height, and weighs just 6.7 oz, making it highly portable and easy to conceal. The revolver is equipped with XS Sights, featuring a white dot front sight and an express-style rear V-notch, enhancing target acquisition. Its rubber pebble-grain grips provide a secure hold, contributing to better control during firing. The Sentinel is available in two configurations: the standard model chambered in .22 WMR with an MSRP of $399, and the Sentinel Conversion model, which includes an additional cylinder for .22 Long Rifle (LR) ammunition, priced at $525. This versatility allows users to switch between calibers based on their preferences or ammunition availability.