There have been many excellent reasons given on this forum for not using Critical Defense in the R9; not the least of which is that they don't make their own primers like the other recommended manufacturers such as Winchester, Federal, Speer, etc.. Despite the warnings about hard primers, headspace, and general incompatibility with small, light striking 9mm pistols, forum members continue to ask about using Critical Defense ammo in the R9. The remaining boxes I have left will go to the range as Glock fodder.