I'm not some much worried about the stock because like you said, you can buy one to fit. I just wondered if i could change out my sps varmint metal for a dbm or hinged. It has the internal mag. Do they make mags for .204?
a 700 SA barreled action is a 700 SA barreled action. the only thing that matters between adl/bdl is the stock and BM. The stock must be inletted for whatever style of BM you decide to go w/. easy solution is a chassis stock like the McRee's Precision. You can get it any way you want it and not have to buy expensive BM to go w/ the new expensive stock. otherwise go on ebay and find the parts you need to do what you want to do. If you go the custom stock route, like H&S/B&C/MCM, you will need to not only order the separate BM, but also the correct stock. (ie: inletted for dbm, etc.) Since you have a SPS stock, just dont worry about making it work, throw it away and get something decent.