A gun manufacturer directly hires a company to test their new line of 9mm handguns. The company that was hired, they go back to their office and pops off a few rounds. They go through the drywall and hit someone. The gun manufacturer could def face charges in this situation.

Edit: your analogy is wrong just due to Irregular being hired by them rather than just being a customer of them

As long as either one gets punished I don't care; at least one of them is guilty.