hey guys, i'm about ready to order one of the new CMMG mk-3 rifles from CDNN when they get some more fde finished ones in stock. well CMMG finally has these rifles on there website and it says they are using billet 6061 T6 for the upper/lower. should this be a cause for concern compared to the 7075 that the high end brands are using to make their guns? thanks for the input guys!