I won my first one back in 1978. It was a .54 cal, but the .45, .50 and .54 calibers were all 1 in 48 twist. Mine was manufactured in Italy and imported by Armsport in VA. I took the gun in kit form to learn a little more about the mechinisms. I totally broke down the lock and diamond filed and high polished all the friction bearing spots. It definately was a faster lock than the ones a few friends had. It's like any other ML, you have to practice etc, etc. And it will shoot as well as you can be proficiant in using it. When I started building my own, my daughter used it to compete. She never finished worse than 5th anywhere she shot. Take care of it and it will treat you right.