The Walther automatic shotgun (German: Automatische Schrotflinte) is a rare German shotgun.
The shotgun uses designs by Fritz Walther and Georg Walther patented in 1918. The actual production dates of this shotgun are sketchy, however; production was stated to have begun in 1921 or 1922, and stated to have ended in 1931 as it did not appear in the 1932 Geco catalog. Original production was handled by Deutsche Werke, better known as DW. However, quality of the DW-produced guns was rather questionable, and as such, distribution was later handed over to Walther, which made refinements to the original design by adding new parts like dust covers and reinforcement ribs. Production figures for this shotgun are also quite sketchy; the highest known serial number for the shotgun is 5751, with the lowest known being 1043. It is possible that the serial numbers started at 1000, though there is also a possibility that serial numbers started at 1, which would put production figures at 5000 – 6000 shotguns produced over a span of about 10 years.
The weapon used a toggle-locked action, but it is not the first toggle-locked shotgun; that honor most likely goes to a shotgun that Sir Hiram Maxim had patented in 1886. Because of its rarity, other details about the inner workings of the weapons are sketchy as it has been said that it is "a nightmare to field strip".
The weapon is of a short recoil design, with the whole rear receiver recoiling back on firing. A toggle joint is seen inside the weapon connected to the bolt. A switch on the left side of the weapon can be toggled to drop the handguard which acts as the magazine tube; the magazine tube holds four shells. A bolt release button can be found on the underside of the receiver just behind the handguard.
The shotgun is chambered for 12 gauge shells, but not of the normal kind; the shotgun is chambered for 65 mm (2 9/16 in) shells, as opposed to the more common 70 mm (2.75 in) shells. It also currently accepts 63.5 mm (2.5 in) and 67 mm (2.63 in) shells.