.357 Magnum

Here is a gun found in the lower Cihangir district, above the Tophane (by the stairs at the end of 'Tüfekçi Salih Sokak'). It looks like a .357 Magnum Colt with 4 mm barrels but it might be something else since I have no knowledge whatsoever with firearms. If anyone knows feel free to post a comment. Its size is approximately 15x10 cm.