It it's an ADL, you will have to replace the stock with one that's inlet for a magazine or dropping floor plate. You can pick up an HS Precision takeoff stock from a Rem700 P/PSS/Mil Spec 5R or similar for about $200-$250. Of course, Manners and McMillan made awesome stocks. The Bell & Carlson Tactical Medalist is another excellent choice that is quite a bit less than the Manners or McMillan, and fully adjustable.
If it's a BDL, then usually there is only minor inletting required.
If you have a stock that's already made to fit a BDL system, CDI Precision will inlet it for $70, shipping included. Their bottom metal is excellent quality, as well.
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