Today's lesson, straight from the range: Never underestimate how much difference

Today's lesson, straight from the range: Never underestimate how much difference a clean barrel makes. Had an old-timer out there who couldn’t hit a thing until we ran a few patches through, suddenly his groups tightened right up. It’s easy to overlook maintenance with all the excitement, but trust me, it’s worth your time. How often do you folks clean yours after a session? Am I just being old-school?