One item was a pair of automatic pistols, with ammunition.
On the moon, I can't see these being much use. In space, equal and opposite reaction would mean that you could fire into space and start yourself moving, very slowly, back towards your spacecraft, if, say, your spacewalk happened to have gone wrong and left you stranded.
The difference being that friction on the surface of the moon would prevent you moving. Unless you jumped in the air and then fired the gun. In which case, even on the moon, you would probably jump about 1mm further than if you'd just jumped normally.
In either situation, throwing the gun might work better, because it's heavier than a bullet. (Maybe I'm underestimating the recoil from a pistol. I've never fired one.)
Also, throwing the gun doesn't depend on the gunpowder, or whatever chemical propellant they use in guns these days, actually working in a vacuum.