This weapon was one of the best railway guns ever manufactured and became the standard railway gun of the German Wehrmacht. Design of the K 5 began in 1934, concurrently with the design of the 21cm K 12, the first gun entered service in 1936 and from then until the end of war the K 5 was in regular production, some 28 weapons having been made by 1945.

The design of the K5 and the K12 overlapped to some extent, as both were intended as a super long-range weapons employing deep-grooved barrels and splined projectiles. The K 5 barrel was made with 12 grooves 10mm (0.39"). A 15cm experimental barrel, known as the 15cm K 5M, was first made and tested, and as with the K 12 a normally-rifled barrel (the 15cm K 5 MKu) was built for comparative trials.

Courtesy One35th.com

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