I asked PSA, via email, 11-08-14, about the issue of compatibility
with their upper and a DPMS type lower. I got a reply yesterday.
Hello,
Thank you for contacting Palmetto State Armory! Unfortuantly we can not guarantee that our AR10 parts will fit properly or function with another manufactures products. We recommend sticking to to strictly all Palmetto State Armory parts when building the PA10 rifle.
Thank you,
Cody
Customer Service
Palmetto State Armory
(803) 724-6950
Info@palmettostatearmory.com