Designed by Giuseppe Bommarito, this was one of the many independent rifle designs submitted to the US War Department in the 1910s hoping for military adoption. It is a short recoil operated, toggle-locked system chambered for .30-06 and using detachable 20-round magazines. It was tested (without much success) at Springfield and remained in development until 1918.
See a more complete article including original disassembly photos here:
Read the full article here