You have a S&W 586 target pistol. If you hit the S&W web site you can down load the owners manual. I have one of these pistols and it is a truly nice pistol to shoot and own. Keep it in good condition (as it appears to be) and it will only go up in value over the years. A truly nice pistol to have for fun, target shooting and for home defense. Pretty hard to find a better 357 with the barrel length, The stainless steel model would be the only exception.