Looking for a bore scope, and I found that there are a lot of fiber optic ones available as optical instruments for $100 - $150. There also seem to be lots of fiber optic models available which don't have optics per se, but have a USB interface to use with a PC. The USB models are $50 or more less expensive. I an amateur gunsmith who only works on my own guns and think I would be satisfied to have to hook the bore scope up to a laptop, as long as it would work well. So anyone used any of the USB type bore scopes? Any in particular makes or models you'd recommend to use, or to stay away from?