Has anyone seen the Jan '10 Small Arms review? In it they show a US soldier with a bullpup rifle that was made in the Philippines during 1945. It is around 42 inches in length. Its a .30-06 semi automatic that uses BAR magazines and has a optic integrated as a carry handle. Hardly anything is known about this rifle, but its designated as the U.S. Mod 45A
It somewhat resembles the HK CAWS in appearence except that it has a long barrel possible 30 inches or longer, and the optic sits higher.
Quote from wiki:
The Model 45A was an experimental bullpup rifle developed by the United States Army in the Philippines in 1945. The weapon existed in prototype or mockup form, but never entered production. The rifle was sparsely documented until Tom Laemlein encountered a number of annotated photographs of the rifle in the archives of the United States Army Signal Corps.
The rifle was constructed in bullpup configuration, utilising the magazine from the Browning Automatic Rifle. Rather than iron sights, it featured an integral scope. Its purpose is unclear, but it is alternately described as a "experimental .30 caliber LMG" or a "field expedient .30 cal."