These are all for the 3 3/4" Joe figures: -The shotgun is 2.5" long -The Leatherneck is 2.7" long -The Spearheads are about 2.9" long -The Low-Light uzi is about 1.25" long -The Sci-Fi blaster is about 2" long -The SAW-Viper guns are about 3.6" long
These things were designed for vehicles from 2003-04, where there was a small slot for the tab to be fit into. Once done, you press a button and it makes a certain sound. To an extent, the Crimson Hydra jet from ROC has this, since it's a repaint of the 2003 Sky Sweeper. But yes, they can be held in figure hands.