What lowers will the DPMS uppers work with?
Aside from DPMS!!!
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Assuming you are talking about the LR-308 (since everyone knows that DPMS AR-15 uppers will work on ALL AR-15 lowers

), then the list is fairly substantial, including but not limited to the following in no particular order:
SI Defense
JD Machine
Fulton Armory
CMMG (both LR-308 mag and G3 mag lowers)
Black Rain Ordnance
Iron Ridge Arms (IRA...not sure if they are still around or not)
Remington R-25 (a DPMS by any other name...)
Tactical Machining (80% lowers, as well as finished, serialized lowers)
Patriot Ordnance Factory (POF)...these lowers will work, but require "bushings" for the upper to pin-up appropriately to the lower.
Hogan...same deal as the POF lower above re: bushings
That's a short list...I'm sure I'm forgetting some of the more "obvious" options, but that should get you started.