Review on USB Rifle Bore Scope With Side View Mirror And Short-Focus Camera For Efficient Gun Barrel Inspections And Cleaning, Compatible With Android, Windows, Mac, And Linux - 5Mm Caliber. by Jared Gopalan

Have used a high end bore scope once before, and was not expecting much here given cost. I was pleasantly surprised. Confirmed clearly where there are copper deposits to clean and Id'd one issue with one barrel. Can definitely see differences between standard and precision barrels, with tooling marks much more visible in the more standard barrels. Worked more smoothly on Mac Book in Photobooth than on android with the recommended app.