Rare hardly describes it. I have been looking for one of them for 40 years. I missed one in Spokane in 1990. I just couldn't afford it. The rifle I saw, looked very decent. I would have shot it, just to see how well it did.
Turkish armorers did some very interesting conversions IMHO. They weren't held back by preconceived ideas. They were handed a bunch of weapons and told to make them work for a certain cartridge. I can't see them issuing unsafe conversions to their troops any more than any other nation would.
The rifle in the pic looks good from what I can see.