After a good five years of running flawlessly my KAC SR15 E3 is finally having issues. I've been getting failure to eject problems. The bolt will not eject the spent case, and it'll try to feed the next cartridge; resulting in a jam. I suspect it may be the extractor springs. My question is: How do I know which one to replace? Is there a more effective way than replacing each spring at a time?
Additionally, I was on Operation Parts and noticed that they have Heavy Extractor Springs for the SR15 bolts. When would heavy springs be applicable? Are they meant for a specific type of ammo?


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