The Mossberg 44B was a rifle built before the war. The 44B was the Framework for the 44US Which was actually made for the sole purpose of troop us. The 44B featured a deluxe, genuine walnut stock with long beaver tail and cheek piece
The real story is in the Mossberg 44US. The 44US was designed exclusively for the war department as a target trainer, intended solely for use by U.S. troops. It was adapted from the pre-war 44B model, and included adaptations like those made to the 42MB -- made mostly to keep costs down. The war department wanted an accurate, dependable, heavy-barreled trainer, and was willing to sacrifice cosmetic detail to make it affordable. While the 44B featured a deluxe, genuine walnut stock with long beavertail and cheek piece, the 44US stock was plain, usually birch with walnut finish. The four-position (adjustable) front swivel plate was removed, and both front and rear swivels were fixed, on the 44US. The hooded front sight was replaced by a plain post, the rear sight was the S-100, originally adjustable forward and back through four sets of screw positions (later reduced to three and then two). The first batch was shipped with Lyman 57MS receiver peep hole sights.
Some Identifying marks of the 44B are
* US PROPERTY marked on barrel, receiver
* Serial Number on barrel, receiver
* Ordnance ball cartouche stamped in stock
* U.S. stamped in stock (in some instances)