i'm too lazy to read the entire thread but there have been guys that have built 9mm and 7.62x25 gas operated ak's as well, im sure a .40 wouldn't be too hard also 40's rim is not too much smaller than 7.62x39 if someone has a .40sw reamer i'd be intereated in making a .40sw ak using a green mountain blank for fun, im sure grease gun mags with tweaked feed lips would work or maybe i would just make a magwell that takes glock mags![]()