I'm going to go with a controversial one:
The FG-42
Yes, this was a marvel of engineering, being a rare rifle-caliber weapon controllable from the shoulder in automatic fire. However, it was excessively expensive, served no purpose by the time it entered production (the Fallshirmjagers were ground-based light infantry by 1942 and no longer needed a gun that combined the 98k and MG-34 for air-drops), and was inferior to another gun developed at the same time (the Mkb 42(H), the first step in the StG-44 line, which was cheaper and an ideal paratrooper weapon, anyway).
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