Basically I was looking for reactions to shooting with Reisings. I have had good luck with them, although they are a bit difficult to control in FA. I read that the double column 20 round mags had feeding problems, so the Services had them squeezed down to 12 round single columns to improve that. I have not had seen bad feeding problems in the limited amount of shooting I've done. When there were stoppages they seemed to trace to ammunition problems rather then the mags.