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Nail gun double fires

My 15 guage finish nailer some times fires twice with one trigger pull. It has a full sequential fireing system with no bump fire option. It is not shooting two nails at once, there are two distinct fires. It almost seems like what ever makes it fire is to sensitve and slightest pressure change on the trigger causes it to fire again. Can you tell me if there is a fix for this?

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  • RCS626 Mar 20, 2009

    In answer to the clarification request, the problem does seem occure more often with a squeeze and release of the trigger than with a squeeze and hold.

  • Dean
    Dean May 11, 2010

    Does it do it if you squeeze the trigger quickly and release quickly? Rather than a prolonged squeeze of the trigger (if that makes sense)?

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  • 25 Answers

There is one main part that can be the cause of the problem.

The trigger. Check to see if there is anything out of the ordinary with this. There should be some moving components attached to the trigger itself. Is any part of the trigger touching the button in the body of the gun when safety is not depressed. If the lever on the trigger is pushing on the button, even a little bit, It will allow the gun to fire again and again.

Posted on Apr 19, 2009

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If you're stuck with bump firing, practice your technique. Double fires often occur when the workpiece bounces back into the nose of the gun; learn to 'bounce' the gun off the material to avoid this second contact.

If you're getting double fires in sequential mode, the problem could be more serious. I keep a can of aerosol silicone lubricant on hand to clean and lubricate the feed mechanism and magazine. Make sure your tool is clean and lubricated before each use, including the 3-5 drops on the air coupling.

Check that your air pressure is not set too high. Overdriving nails reduces their effectiveness and can cause tool malfunction.

This problem could also be caused by worn out O-rings or other parts within the tool. If you're not comfortable servicing the tool yourself, take it in for repair/maintenance work.

Another important thing to remember: With tools like this, you get what you pay for. A cheap nailgun will never function as well as a quality nailgun.

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