In general many of the parts are not interchangeable between milspec AR15 and either DPMS or KAC pattern AR10s. In fact off the top of my head only trigger groups, safety assemblies, and in some versions the charging handle and buffer tubes may be interchangeable. Having built both AR-15s and AR-10s, AR-10s are much more finicky with parts combinations from different manufacturers. Best bet is to buy a receiver set/bcg/handguard from a reputable company so you know all the parts will interact well