Bore scope

[birddog67]

What is a decent one that will not brake the bank ?

 

[drbill]

This one

GRADIENT LENS 17" SLIM HAWKEYE BORESCOPE KIT | Brownells

 

[SidecarFlip]

Bore size will determine price. If you have a larger hole you could use a Harbor Freight scope for less than a hundred dollars.

Gradient (Hawkeye) sells direct as well.