In addition to building three main patterns of straight-pull bolt action rifle for the Canadian military and the commercial market, Sir Charles Ross also experimented with self-loading rifles.
Starting with a standard Ross Mk III, this experimental rifle has a gas piston and trigger to allow automatic fire and a very neat forced-air cooling system. A one-way rather mechanism (now broken, unfortunately) spins the fan when the bolt cycles, pushing air into a barrel shroud similar to that of a Lewis gun. This rifle was most likely made in 1915 or 1916 with an eye to a military light machine gun or automatic rifle contract – which never happened.
I kind of want to put a hand crank on the other side. Cause, you know.
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Oh, damn, I love it.