I’ve bought 3 Uberti’s in the past year. No issues with the factory cones on my Walker. Tried Slix shots on my 1860 and it actually gave me more issues than the stock nipples, so I’ve been using factory on that. Now my ‘51 seems to blast the caps apart whether I use factory or the slix shots, so I put the factory ones back in that until I get that one figured out. Seems like people just automatically put the slix in before testing the factory nipples first. But maybe the factory cones are of better quality lately. Just my experience