Ruger generally wants you to send the entire pistol in for repairs (not just the upper). If they determine the barrel or receiver needs replaced, they just replace the entire pistol rather than change out barrels. At least that was my experience sending in a MKIII with a crooked chamber. The new pistol then goes to an FFL and not directly back to you.Can you clarify this statement. Are you saying they have to send it to an FFL for a barrel replacement/repairs or when they replace the entire firearm with a new one?