well... the barrel is a US take off, so I know the barrel is good... all the pins will be oversized new tool steel... several new springs, & a new firing pin, the breach block will be bushed to clean up & center the firing pin on the new bore... I'm sure this rifle fired many 303 British, though quite possibly black powder, & whom ever cleaned it up & re-blued it, ground a lot of thickness off the sides of the receiver, to get the bulk of the pitting off the gun, so that is my main concern... how bad is the receiver steel ( carbon deposits ??? ) & did it get thinned beyond service ???
In life you either make dust or eat dust...