American Tactical is angling to appeal to collectors, promising that the first 1,100 guns sold will come with a wooden display crate, styled like a 1940s-era ammo case, and stamped with an MP40 logo.

The Walther MP series included the Maschinen Pistole Lang (long submachine gun) or MPL; and the Maschinen Pistole Kurz (short submachine gun) or MPK. Both were developed during the late 1950s and ...