I am looking at an AII 243 Mannlicher on an internet site, but I am confused about the barrel length. The owner says it is 19" to the bolt face or 18.5" to the front of the receiver. I thought barrel lengths on the Mannlichers were either 18.5" or 20" to the bolt face. Can anyone help with this? The barrel appears to be intact with factory sights. Thanks in advance for any help.