I went ahead and ordered a KS47 lower and upper. On PSA’s web sight the question was asked if the lowers would work with AK74 mags and someone responded that it would and that they built a 5.45x39 upper that works with the KS47 lower. I also ordered some AK74 mags and if they do in fact work then I’ll but another KS47 upper and replace the barrel and bolt.