[ithacaartist]

It's correct that the rear feed lip ejector conflicts with the original. I'd say that removal of the latter is more than a suggestion! I cheat a bit by wedging a small piece of plastic under the extractor to keep it out of the way when the SE 08 kit is installed.

In my experience (Yes, that dreaded phrase), Erma actions and mags most often present a jam with a round trapped nose-up by the returning breech block. Either that, or the sharp edge at the top of the chamber has dug itself into the front of the bullet. This is largely caused by the geometry of the business end of the mag and how the follower's upward pressure influences the round on its way into the chamber--after a certain point in its travel, the round's nose has a tendency to rise. How the front feed lips are tuned makes a great difference.

Each specific style of projectile nose is a little different, let alone those among various manufacturers. The front feed lips need to be quite close, without allowing lateral play of the round as it moves forward--if not provide just a whisker of resistance. This helps keep the nose down. The mags for the conversion kits that don't have dedicated ejectors each have one spring steel front feed lip which I opine was designed to help this situation without tuning.

I can see how a feed ramp might not have been initially created because the ammo generally needs little, if any, guidance/control to keep it from diving too far down while being chambered.