"My" take on "FULL" custom build starts with an after market custom action (BHA, Stiller, Defiance, Bat Machine, etc) and custom components. Custom build/customized build is with donor action from major rifle manufacturer (Remington, Savage, Howa, Tikka, etc). I understand that accuracy is dependent of how and who build the rifle. Just asking for a short and sweet definition. Flame away!