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US patent No. 367336 was a unique design with great potential. It introduced a combination of features that would not be commonly used until the boom of automatic rifles in the 1940s. Winchester, however, had no place for such a design in their product line, despite eventually purchasing the patent. Browning too, largely abandoned this particular arrangement but the operating principles would be commonly used in his later work.
The rifle is a pump action with a tilting bolt. It employs an internal hammer with a cocking spur extending into the trigger guard, similar to the Spencer shotgun. The breech-block is locked by abutting the rear of the receiver, which is given a distinct “humpback” shape that would become characteristic of Browning designs. A secondary sear was provided as a safety against an out-of-battery discharge. This secondary sear allowed for safe, rapid fire and would be used extensively in other Browning designs.
Inventor: John Browning, Matthew Browning
Patent Attorney: John Earle
Assigned: Winchester, date unknown