I just took my Kahr MK40 to Mail Boxes etc to ship back to Kahr for some service work. They called Fed-ex and Fed-ex said it was ok to ship the entire gun if I was shipping to the manufacturer of the gun. I hope everything goes allright, since it is Saturday it will not actually ship until Monday. The cost of shipping plus insurance was less than $30 using 2-day delivery with Fed-ex.
They called UPS, and UPS said I would have to bring the gun to them directly to ship, but from what I have heard. and I may have misunderstood, but UPS tacks on like a $60 fee for firearms. I could be wrong, I'll check the net and see if I can find the story I read about UPS.
DaHaMac