great question to a simple answer, it won't work. i called samson and i spoke with a tech. They sell a proprietary barrel nut part number "DPMS-BN" because my original thought was to use, like you said, a proprietary barrel nut that gives me the flexibility to use different ar-15 handguards. the tech simply said that the threads on the G2 are different than the LR generation. which brings the subject of why gen 3 pmags don't function properly on the G2's, that's a whole different thread that i started..DPMS claims that the G2 platform is the thing of the future but i think they made it a little complicated. my opinion only.