You just need an FFL in the recipient's state of residence to do the transfer. If you need to ship the gun to the MO FFL, there are some restrictions. I don't believe that USPS will allow a private individual to ship a gun to an FFL, but UPS and FedEx will, with certain restrictions. Also, be aware that some FFLs won't accept guns from private individuals, even though it's legal.
EDIT - after reading bittorrent's reply below, I re-read the OP and realized there are *two* guns involved. He's right - each person who's receiving a gun needs to have the transfer of that firearm done in *his* state.
Last edited by ScottRiqui; March 13, 2012 at 11:13 PM.