They are a drop in and seem to be the choice among factory rifles these days since they are less then 50% of the price of comparable hand made fiberglass stocks. Remington TI and all the Weatherby Fibermark and Accumarks are using them. I think they are an OK value for a stock , they sometimes tend to be heavier then the wood stock they are replacing but wood also varies in density as well. I would think in a heavy recoiling rifle I would rather have a McMillan or Rimrock and for a lightweight stock a HIgh TEch. But a 308 should be fine with a B&C