Brophy has a picture of this rifle on page 85 in his book "The Springfield 1903 Rifle". He captions the picture with "The United States Historical Institute caption of this photograph states: "Modified U.S. Rifle, Cal .30 M1903 designed for experiment by cavalry 3/27/40." However this author does not believe any serious consideration for military use was given this rifle."
Brophy also adds, "A carbine that General George Patton was supposed to have somthing to do with is a modified '03 rifle that was stocked in the "Bull Pup" manner used by some sportsmen who wanted a short rifle. It is difficult for me to believe that any serious consideration of this rifle was made by cavalry or Ordnance personnel; the added cost and weight of the stock and attachment system, complicated latch-up of the trigger mechanism, and the exceptionally high front sight and obsolete Krag rear sight would all be negative factors. etc, etc, ....
If I could ever figure out how to post pictures I would have attached it.
Ken