That's all good. But be nice to doopydoo's. They have massive work load, and plenty of other Americans had their kits delivered without a problem. It's not doopydoo's fault that your customs office can't tell resin from a real gun (with your gun laws, I'd expect them to know). If doopydoo would send each blaster with different delivery services just because the customer requests it, it would be a 2 month waiting list, or even more.
Sci-Fire are awesome, no disagreement there. But they do make things in smaller runs than doopydoo. So consider those things above before you blast them.