I own one and love it. I found a company out of Canada of all places that makes a scope mount for the BM59 and similar rifles. They sell one specifically for the BM59. I ordered one and mounted it and it is solid and in my option is worth the price. I did have to remove the rear sights but easily put back on.
I scored 10 magazines for it extremely cheap. All were brand new Italian surplus plus I got two brand new bayonets still in vapor paper.