Most hollow bolts have sights. I have heard that the ones without sights were sold to dealers for selling large amounts of m77’s so they are pretty rare.
the hollow bolts were a long action. They came out just after the flat bolt long action. The short action flat bolts were probably produced the same time as the hollow bolts.
Thanks for the responses! Now I will see if anybody puts them on sale!
I have always wanted to try one but wondered if they were better than the other red dots