Hi, hope I am posting this in the right place...
I recently bought a borescope. Cool toy!! Anyway, I have searched all over, and not found any examples of bore-scoping that can help explain what these images of mine show. It is a 1984 Marlin Model 995 .22 rimfire. I bought it used; it was about 3 or 4 years old when I bought it.
So I borescoped it with my new toy, and found the posted images. The marks in the rifling are in both the lands and the grooves, and extend from the beginning of the rifling, all the way to the muzzle. I am somewhat new to gun smithing (and borescoping), but I cannot imagine what made these marks, grooves perpendicular to the rifling, and all the way to the muzzle. The marks seem to show wear; as though they were there from the factory and have worn down from shooting use. What could have caused this, and will it affect accuracy???The last two pics show the muzzle end, which as you can see looks terrible, so I went ahead and cut 1/2" off the muzzle and did a new 7 degree crown with a protection relief.
This has always been used to shoot cans and bottles, and to let the kids use, so I can't say exactly how the accuracy has been. But I was hoping to use it to hone my accuracy skills, shooting groups. What do you all think?
Thanks!
Vettepilot