What I think Skeetx is getting at is "WHY are the screws buggered?"

Often when screws are screwed, it is because somebody has been screwing around in the interior of the gun, and usually there was a reason for that beyond the mere curiosity of the "hardware challenged." Like something wasn't working right and Bubba went in to have a look.

And the repairs that screwdriver-challenged people do often aren't the best work. Needs investigation; can be an indication of problems to come.