From the product shipping the day after I ordered it, arriving promptly, to doing the job as promised! I have a S&W that had horrible burrs on the crown from the factory, some pointed out and some pointed in. This caused shots over 6 inches low and left at 20 yards unless I compensated. Less than an hour, mostly charging my drill battery a few times, and the crown is lapped. Shove a few cotton balls in the barrel to save on clean up, I taped my gun with painter's tape to guard the finish. Thanks Brother!