A Grand Rapid Plant Saginaw Stearing Gear.
Most parts seem to be matching, with the exception of the stock and the handguard, they're from an Underwood. But the rest seems to be ok.
http://www.milsurps.com/images/impor...IMG_9311-1.jpg
http://www.milsurps.com/images/impor...IMG_9313-1.jpg
http://www.milsurps.com/images/impor...IMG_9314-1.jpg
http://www.milsurps.com/images/impor...IMG_9316-1.jpg
http://www.milsurps.com/images/impor...IMG_9325-1.jpg
http://www.milsurps.com/images/impor...IMG_9317-1.jpg
http://www.milsurps.com/images/impor...IMG_9321-1.jpg
http://www.milsurps.com/images/impor...IMG_9322-1.jpg
http://www.milsurps.com/images/impor...IMG_9324-1.jpg
http://www.milsurps.com/images/impor...IMG_9328-1.jpg
http://www.milsurps.com/images/impor...IMG_9329-1.jpg
http://www.milsurps.com/images/impor...IMG_9332-1.jpg
http://www.milsurps.com/images/impor...IMG_9333-1.jpg