Numerous rifles were rebuilt, especially Vietnam era rifles. Usually the barrels were changed. Some examples of markings discovered on replacment barrels include things like: Sadly, I am on travel so I can't write-up images in the bolt. It is actually MPC engraved. The one marking about the carrier is the https://troymyywu.nytechwiki.com/10131935/colt_python_6_for_sale_for_dummies