WRA made slightly more than 500,000 Garands, but some parts are very hard to find for a parts correct build or restoration. I've been down this path a few times and was never able to locate a WRA stock or barrel. You can find all other parts over time, altho the WRA gas cylinders are very scarce. Drawing numbers changed on quite a few parts throughout production, so it is necessary to find revision numbers which are approptiate for the mfr date of the receiver. Finding a WRA stock with the right cartouche is a double challenge and there are a lot of fakes out there.
When blasting a WRA receiver for parkerizing you need to be careful not to wash out the stampings, some of which are quite light.