Action: Single Action - Caliber: 22 - Capacity: 5 - Barrel Length: 1.163 - Overall Length: 4 - Weight: 4.5 oz. The NAA .22 Long Rifle 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. As with every NAA Mini-Revolver the hammer need not rest on an empty chamber. Using the original half-way notch cylinder the hammer may rest safely and securely without chance of accidental discharge.