I’m pretty sure this hasn’t surfaced previously. Commonplace is Cobra Commander’s weird blow dryer/flashlight/laser pistol-thing.
It came with his 1982 straight-arm figure, and the 1983 swivel-arm retool, and the 1984 mail-in hooded version of the character. (Embarrassing trivia: My brother and I never knew the gun fit into CC’s back! I figured this out in 2008, meaning I should probably call off this whole book thing.)
From 1981, here’s Greg Berndtson’s control art for the weapon in question. This was drawn concurrently with Ron Rudat’s figure turnaround.
And here’s Cobra Commander’s other weapon, the one that wasn’t ever produced and did not come packed with the Cobra Commander action figures!
Know of any other designed-but-scrapped weapons?