I might be wrong but stocks with aluminum bedding blocks would qualify. Also, I may be wrong but high end stocks are pre-bedded.
Aluminum bedding block stocks in general do not qualify. I've a number of these and none were perfect as manufactured.
High end stocks, McMillan for an example brand I use, may have much better fit tolerances than typical factory stocks but it's impossible to pre-bed without the particular barreled action in hand.
