Along the lines of the MSA and AR 15 magazine LRBHO, this is already being pursued as a unit with the release of the BASTARD system from MSA. I could only assume that MSA could modify their design to make a LRBHO for their own AR Mag Adapter (Link here for your consideration http://forum.saiga-12.com/index.php?/topic/64486-bastard/ ). I like the idea of making it for the standard mag. everybody has one of those and it maybe cross platform (i.e. .223, 5.45, and 7.62). That's just my cents