[Given he's not even really sure where she's digging around, watching is something of a fascinating if not weird thing. He must not have been expecting much by way of results as he's surprised when Harley comes up with so much.]

That is extremely useful. And mind-boggling but I suppose it's not the only thing that doesn't make sense here.

[Tech shrugs and ejects one of the cartridges from a gun, pocketing it so he can pop in one of the newly produced ones into place. He takes several shots with the thing with a faint but satisfied smile.]

Yes, I think they work just fine.