I can’t remember the name of the piece but it’s a very common problem. Crack shots aren’t a rare gun but hard to find one that locks up tight. The piece is small and round I believe. Don’t think you’ll be able to find the part. I know a few guys who used to collect them and they must have been...
That’s a big one of that style for NW Indiana. They are more known for being found in Missouri and southern Illinois but we do get them in northern Indiana. They are usually 1 1/2- 2” long maybe. Not sure on the material. Looks like possibly Hixson? Is it Translucent?
Definitely a training rifle. These were pretty nice well-built guns with nice adjustable sights. And also not something you see all the time. Not sure on production numbers but you will usually see them priced $600-800. Depending on condition.
some times when sent back in for repair or warranty work. They’d put a second stamp. Sometimes also they’d stamp a month and year stamp. Does this rifle have a serial number?