North American Arms Mini Revolver, Single Action Only, Revolver, 22 WMR, 1.125 Barrel, Stainless Steel, Silver, Wood Grips, Fixed Sights, 5 Rounds NAA-22MS The NAA .22 Magnum is the most popular Mini-Revolver ever produced. With the many current accessories, it is versatile for many applications and is the standard by which other Mini-Revolvers are judged.