Perhaps unpractical is a better word. It could do what it promised, just not for long. And it was a very niche tool for a failing state who needed resources for more important things.
Really a decent execution on a fairly stupid idea. Given the period I don't think they could've gotten much better for the solution to their mostly non-existent problem.
If memory serves, the bullets often disintegrated into shrapnel in the process of curving out of the barrel, which is probably a mite inconvenient in most situations.
It's neat, but I wouldn't want to bet my squad's survival on it, that's for damn sure.
The Krummlauf was designed out of necessity. Ferdinand Porsche had produced 90 chassis for the Panzerkampfwagen VI "Tiger", which was not built in his factory but by Henschel. In order to be able to use the chassis after all, they were used for a new tank destroyer and were given the name "Ferdinand", later "Elefant" with improvements such as an MG-34 in the front. As the "Ferdinand" had no machine guns for close range, Soviet infantrymen on the Eastern Front were able to approach and fight the tank destroyers relatively safely. Thus, the curved barrel was developed for the Sturmgewehr 44 so that the tank crews could fire through the hatches of the tank and thus better fend off approaching infantry; there were also versions for inserting into the gun barrel.
Due to the bend in the barrel, the fired projectiles were subjected to strong friction and heated up so much that they finally burst as they exited. This meant that the charge effectively corresponded to a shot load, which was no disadvantage in close firefights. The wear on these barrels was high. In order to be able to aim around the corner, a groove was required in the crook barrel (from the height of the actual muzzle of a normal 44 assault rifle), in which a mirror device (prism attachment) was attached.
wasn't it for tank crews to hose down the outside of their tanks without exposing themselves? I had assumed it functioned properly for that. I assume the bent MP40 performed better, since you're not dealing with a high velocity cartridge
It was, which would indeed be a highly niche use. A tank being swarmed with infantry literally on top of, and there being no friendly infantry or tanks around to help to the point of wanting a curved barrel is a situation that is so bad it probably can't be solved by just a curved barrel.