North American Arms The Wasp, Single Action Only, Revolver, 22 WMR, 1.625 Barrel, Matte Finish, Stainless Steel, Silver, Rubber Grips, Fixed Sights, 5 Rounds NAA-22M-TW 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.