With the 16/116 XP you get a DBM but it is the plastic DBM setup similar to the Axis. With the 16/116 FCSS you get the all Stainless DBM setup as well as the accustock.
FWIW the stocks that come on all the XP's I have seen are pretty flimsy in the forearm area. The accustock is more rigid, however depending on the price difference you encounter (as retail often varies a fair amount from MSRP) you may be able to afford to upgrade to a aftermarket stock depending on your needs.
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