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[–] robot7247 ago 

OP, It sounds like the 870 isn't going completely into battery or lock-up before you fire it. When is the last time you cleaned it down to the component parts? Shotgun powder rarely completely burns. As you eject cases any unburned powder will dump in to the action. Over time it will jam it. I'd start with a thorough disassembly, CLP cleaning, then reassess. While you have it apart inspect the action (slide arms & bolt assy) for any burrs.