Is it possible to convert a Ruger American rifle in 7.62x39 to use AR magazines? I downloaded the instruction manual and see the magazine well and release is a separate assembly. Would it be as simple as swapping the magazine well for one of the .223 models that takes AR mags? My thinking is that both .223 and 7.62x39 magazines will both work in the same AR-15 lower. If this is possible, what specific parts would I need to order and would Ruger sell them to me?