Lucky you!! At least you had the base for it on yours! I will probably go RSI when I get the time and money to build my barreled action. It came to me without a scope mount base or a stock. Glad you found one.
You should show us your build when you get the mount.
PS- Welcome aboard too!
Every snowflake is unique. There are uncountable grains of sand on the beach. Mosin-Nagants are like sandy snowflakes. You’ll never get all the ones you want.