No, not those dirty magazines!
A significant percentage of firearms functioning failures are do to magazine-related issues. Specifically, either broken (bent) or dirty magazines!
You probably know how to disassemble (or at least field-strip) your firearm, but do you know how to clean your magazines?
Some cannot be disassembled, some can, but not with ease and others are relatively easy.
Learn and lubricate (as appropriate for your specific environment) and live well!
When’s the last time you inspected and cleaned YOURS?