So what do we call someone who unknowingly turns out a job with machining mistakes because he's too arrogant to check his work? Not saying that you routinely turn out jobs with mistakes, but since you said you don't check your work, the implication is there that it happens from time to time.
A DUMBASS!
I check my work every step of the way. I just don't see the need to testfire a rebarrel.