just ran my 1,000th round through my 642 tonight. i am surprised how well the action smoothed out. i also dry fired it 500 times with snap caps. it has the zit on the side, but the lock has not caused any problems. it also has never been locked. my 642 has the power port and i had to get comfortable with the blast directed upward in front of my line of vision. i like this gun! accuracy is excellent and 100 percent reliable. s&w hit a home run with this little pocket gem.