Yes you can ship pistols through the UPS. Just tell the guy to take it apart and ship it to you in differant boxes. Perfectly legal. Becouse it is parts not the full pistol.
That is entirely wrong and could get you jail time if caught.
Yes you can ship guns in the mail, UPS or whatever but there are stipulations. You can't simply take it apart and put it in the mail.
You must go to a gun shop and have them give you a signed copy of their FFL. You must mail it along with your payment to the shipping dealer. The shipping dealer keeps the copy of the FFL for their records and ships the gun to the same shop that you got the FFL from. This shop will call you when the gun arrives and then perform the required back ground check and paperwork. After the background check you go home with the gun after paying the store a transfer fee which is usually $10 - $25 for the paperwork and background check.
You can ship all of the parts except for the controled part, which is usually the frame or receiver, with normal shipping methods. The controled part is the part that has the sereal number stamped on it. At least this part must be shipped in the manner above and the required background check and paperwork filled out.