With the AR10 platform you need to know exactly want you want to build. RRA,Armalite,and DPMS are the main mfg's,and each one is different.
So if you buy one brand of lower,you'll have to find out what parts are compatible with it. They do not interchange like an AR15.
CMMG,and Mega also produce lowers,and I think they do both DPMS and Armalite styles.
Last edited by Txhillbilly; 12-29-2012 at 05:46 PM.