I don't know of too many drop in replacements. Everytime I have ordered a barrel, they say it should be real close, but the smith still has to do some fitting to my stock.

Go to Dan Lilja webpage, and measure your contour with your barreled action out of the stock. Then find the one closest. Order the blank. Find a good gunsmith to thread and chamber, crownand bed, and your done. Sometimes your smith will order one for you. But you might find them cheaper on your own. I know sinclair intl has them in stock.