skprice44 the picture you have shown is a 5 or 6 inch barrel. From the grips and hammer it appears to be an old M&P the forerunner of the Model 10. BTW the barrel is measured from the front of the cylinder to the end of the barrel. Many new owners think the barrel is measured where it screws into the frame to the end. While you can't go too wrong with one please don't shoot +P ammo in it even though it will chamber it. The +P ammo can cause excessive wear of some of the internal parts. the steel used back when it was made isn't as strong as the steels used today.