It was an ugly little gun, and like the drawing’s text says, “cheap and easy to make.” That’s why the moniker “grease gun” was so appropriate.
The M3A1 had a stamped, riveted, and welded construction, which meant it was difficult if not impossible to work on, and was meant to be discarded if it ever became inoperable in the field. Over 15,000 of the M3A1 submachine guns were produced.
Click to Enlarge to 850 x 589 px:
Source: Popular Science July 1951
