Inspecting the inside of barrels...........

[buckleymarka56]

Guys, I have a borescope for mechanical work. It is will not work for inspecting inside ML barrels. I also have a cheap borescope that attaches to the end of a flashlight. It will not do the trick either. Can someone give me some pointers on where to get a lower cost borescope that will work for inspecting inside ML barrels. I do not want to purchase another one that will not do the job.

Thank you.

Many years a bought a small flexible scope, plugs into a USB on a computer. , it's about 4 ft lo g and I can see all the way to the bp.