Evaluating this first pilot, we're thinking of adjusting delivery options. We went with UPS because their regulations allow intra-Oahu small cartridge delivery (FedEx doesn't), because most people usually trust the established big three of shipping (UPS, FedEx, and USPS) to come to their homes etc, and because UPS has a very good tracking and accountability system. The adult signature is a hassle for all (and actually an expensive service), but the value of the packages and its contents pretty much necessitated it.
In future pallets, we are leaning towards offering two options for delivery. Before the first pallet, we looked to see if any there are any courier services that could do the delivery, but several refused because "guns..." and most were just astronomically priced. So, we are thinking of essentially becoming our own private courier (like how pizza delivery works) and also offer a UPS option as an addon.