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I can confirm the Tactical Machining lower works with an Aero upper (at least with Pmags and Duramags). I haven't machined or fired the 80lowers ones yet but they hand cycle rounds just fine with an Aero and Stag upper respectively.Here ya go. If yours is off on this dimension that's your culprit. Swapping all the components in the world won't work unless you figure out a way to lower that mag catch itself. That will probably be trickier than raising it in my case. But ya never know, could just be simply grinding the catch lower.
And it's really only the little tab that sticks out from the "armature" that needs lowering.
Here's the whole thread for reference:
DMPS .308 FTF issue please help!
I could measure a stag lower for you. According to their website, everything DPMS style fits in their receivers, despite having a slant cutwww.northwestfirearms.com