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I'm still with jayinsat on this one about the striker tunnel. The striker has to be pulled completely out to clean the tunnel properly, and a pipe cleaner is the best thing to use to clear it out with. Tulammo is pretty dirty stuff and will leave a lot of residue in the striker tunnel, in addition to the heavy storage lube that Ruger uses. To pull the striker, once the slide is off, you have to depress the little pin inset into the back of the plastic plate that is at the back of the slide. I use a straightened out paperclip to depress the pin. It can be a little tricky to put it back on the first or second time you do it. There are videos on the 'Net about this. If you did do that, my apologies, and I agree that it needs to go back to Ruger; maybe there is a burr in the tunnel or some other defect that is causing the striker to hang up and thus light strikes. Good luck.