Cheap USB Bore Scope?

[CyborgHunter]

Anybody ever tried one of the cheap ($20'ish) USB borescope/camera/endoscopes on their rifle?
Seems like it might work. They attach right to your smartphone, or computer, so you are not paying for a screen/reader like with a Lyman.

One issue would be getting one with a small enough head diameter to fit down a .22, or 5.56 bore.
The smallest I've found on line--in the sub $100 category--are 5.5mm . In theory, that would fit.

[AleksanderSuave]

Anybody ever tried one of the cheap ($20'ish) USB borescope/camera/endoscopes on their rifle?
Seems like it might work. They attach right to your smartphone, or computer, so you are not paying for a screen/reader like with a Lyman.

One issue would be getting one with a small enough head diameter to fit down a .22, or 5.56 bore.
The smallest I've found on line--in the sub $100 category--are 5.5mm . In theory, that would fit.

I used this previously: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

wasnt worth keeping (bought for a project, forgot to use it), but its a decent product.

[CyborgHunter]

Did you ever try it on a rifle barrel?
Seems like it has a long focal length for inspecting a gun barrel
From the ad:
"the best observation distance is about 1.2Inch-2.36Inch"