I think that may be because if your RRA 9mm was like mine, it has no feed cone, just a chamber that completely supports the round. Great for hot loads as it’s got maximum case support, but if there’s any issue with the feed angle, it’s a malfunction. So having a good mag feeding at the correct angle is important. Usually feed cones are more important with Glock builds since they can’t feed as low as Colt pattern mags. Personally, I like max case support in case of an OOB and tend to save the NATO and +p loads for my AR9s.
Bookmarks