A Turkish Contract Winchester Model 1866 fitted a barrel jacket. Probably used by the Turks for training machine gunners.
https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...959#post156820
https://www.homemadetools.net/forum/...436#post150979
https://www.homemadetools.net/forum/...374#post150738
https://www.homemadetools.net/forum/...515#post132162
