Re: AR-10 Receiver?
The list of 308 AR manufactures using the DPMS mag is big and getting bigger all the time. Here's a list, probably not complete, of those making complete rifles or uppers and lowers in the DPMS mag pattern:
KAC
DPMS
SI Defense
Fulton Armory
JD Machine Tech
Kaiser Works
Tactical Machining
JP Rifles
POF
Mega
LMT
LWRC
Seekins (soon to released I believe)
Oberland Arms
LaRue
Les Bauer
EDM Arms
Bushmaster
Remington (just a repainted DPMS)
RND
AXTS
Fidelis Arms
Iron Ridge Arms
If anyone want's to add or correct that list, feel free to do so.
Out of that list, many of those receivers have different shapes and specs and won't interchange with one another.
Best to do a lot of research and them most likely, you'll be purchasing from the manufacturer.