Yugo M59/66 rare variant?

[.45Barracuda]

Is there anyone who knows more about these rifles?

John has 2 for sale in his personal vault. How rare are they, what night vision is supposed to fit on the mounts, etc?

http://www.marstar.ca/gf-John-Vault/images/J2211.jpg

Thank you

 

[Dsiwy]

orginal Scope mount ones are rare yes

 

[Woodbeef]

Besides being very very rare,they're consecutively numbered.