Yes to both. Significant modification to the rifle is required but apparently nothing that can't be accomplished with some basic power tools and ingenuity. There's YouTube test fire videos by a board member who tried this successfully. Someone should be able to resurrect the thread (which I believe got locked due to repeated hijacks by ignorant trolls).
Same concept but yes, I see your point.
FWIW a LAR mag will load and feed 7.62x39, just not ten rounds of it.



























