Both my 870's run fine but I have had guys claim the tool steel extractors are a must have upgrade and have heard replacing plastic shell followers and some springs would increase reliability. I am not an 870 nut, that's why I ask, however in firearms in general it is common practice to upgrade internals to increase performance/reliability. There is an entire market centered around just that for Glocks, 10/22's and of course AR's. Your comment above makes it sound like you think it's nuts that someone would think of doing it for an 870. I don't know 870's, that's why I ask if there was.