The only clue you will have in what that receiver was chambered in, is the bolt face and extractor. That would narrow it down to 7x57, 8x57, 7.63x53 and maybe 7.62x51.
The Turks bought every Mauser and captured almost every Mauser chambering made. If they had enough of them, along with captured ammunition, they would reissue them to multiple units until their bores wore out then rebarrel and remark them to 8x57.
Later, if they couldn't capture, steal or buy the ammunition, their talented gun techs would refabricate them into something that was more suitable to their purposes. For many years, that was the 8x57.
They even converted all variations or No1 Lee Enfields to the 8x57 cartridge, by rebarreling and modifying the magazine wells and fore ends/top wood. Look up "Frankenmausers".
In the fifties, they bought up surplus, 98 Mausers, No4 Lee Enfields, US 1903 variants, M1 Carbines and Garands and supposedly even came upon a bunch of Mosin Nagants. I have yet to see a Turkish marked Mosin though. If they ever really had them, they would be perfect to loan out to other nations of iterest without altering the markings.
A lot of people like to underestimate Turkish firearms. That is a huge mistake, especially for collectors. Mind you, they are starting to come into their stride.
Turk weapons, have been to war all over Europe, Africa, the Far East, Middle East and even some are to be found in South American conflicts.
They often look like hell, because they've been there and come back again.
Many Turkish forces, like their police etc, were given the last of the WWII stuff about 30 years ago. They weren't given much for support or spare parts. That's why you see so many of them cobbled together with bits and pieces. Sometimes even hand made parts.
That's a decent looking 95 action. It would make a nice sporter. IMHO it's hardly worth trying to find the parts to put it back into its original form. For one thing, you don't know what that form was or whoes army it was originally built for.
It would make up into a very nice 7.62x39 bolt action sporter, capable of some fairly stiff loads and using heavier bullets.
