Your evaluation makes sense to me. If the lip tips the cartridge nose up, I wonder if the lip was added to help prevent nosedive jams. Has any of your ammo tried to nosedive? On the other hand, mine will experience nosedive jams when using flat point or hollow points, so I suppose maybe the lip was not for preventing nosedives.
I'm glad it's running well for you! For the life of me, I don't know why it has taken so much time and experimentation to get these pistols running properly. I would expect that the engineers and gunsmiths employed by Remington would have figured all this out long ago. I think the R51 is a nice little carry pistol, but Holy Smokes! they've got to make them run reliably without every purchaser having to troubleshoot the things after they get them home. Howard
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