Old thread, but fairly certain this is a rifle by the British makers/inventors, the Green Brothers, they patented a number of systems, and I think this is based on their provisional patent, no.1794 April 28. 1876.
"Breech actions, sliding breech-block; protecting from dust and rain. -- Relates to the breech-loading rifle described in Specification No.49 A.D.1871"
The cut out in the side of the barrel breech was to allow the bolt to lock firmly when pushed forward and closed.
Last edited by stenoyab; 26th August 2017 at 06:52 PM.
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