http://www.ar10t.com/After reading a few (cough) threads, How do ARMALITEs rate? My lack of aptitude precludes "just" building it myself. looking at the 20" .308 model.
Their AR10s take Armalite's mags only. The DPMS and P Mags will not work in them.
Besides magazine availability I am not very familiar with them.
I have a DPMS and love it btw.