What is a Turkish Mauser and Why do you want one ???
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The mainstays of the custom rifle builders of the 20's, 30's, 40's and 50's were 1903 Springfields and Mauser 98's. (Unless you were a bit strange and used the SMLE) Springfields have gotten sort of expensive and, if in good condition, are better left unmodified. Mauser 98's are about the same.
Most of the Turkish Mausers now on sale for $40-50 are a version of the Model 98, made in Turkey in the early 40's. These rifles are (at this time) plentiful and cheap, and as of yet have no historical value. This means that they are perfect raw material for the amateur gunsmith or tinkerer.
This text deals with those long rifles, chambered in 8 x 57, marked K.KALE 194?. Other rifles sold as Turkish Mausers are versions of pre-98 rifles or Model 98,s or SMLE's that have been modified to Turkish standards.
The K.Kale receivers are identical to the Mauser Model of 1898 (known as the Large Ring Mauser) with two exceptions:
This shows the reason that the "ring" is longer than standard. The Turks allowed the front to extend ahead to secure the upper stock piece. If this extension is removed, either by filing or by a lathe cut, the receiver will externally be identical to the Model of 1898.
Here we have two Turks, the upper is uncut, while the lower has had the extension removed.
This is a view of the cut "ring", that is, the extension has been removed.
These are all Mauser barrels. The top barrel is a "large ring" standard thread, below it is a barrel removed from a Turk, the bottom is an 1896 Swedish in 6.5x55. Note that the lower two have smaller diameter threads. These small threads are "small ring" standard.
The two small ring barrels have headspace gauges extending from the chambers. Note that they appear (and are) identical. The easiest way to rebarrel a Turk is to screw a Swedish barrel onto the receiver and put the wood back on. Long Swedish barrels are available from SAMCO (blued, new, with no sights) or Springfield Sporters (used, with sights).