It sounds like the gun is working properly but is having feeding problems. First, make sure you are using the proper staples for your gun. Senco makes three versions of the SKS(XP) stapler: The SKS L11-17 drives 18 gauge, 1/4" staples. The SKS M12-17 drives 18 gauge, 3/8" staples. The SKS N12-17 drives 16 guage, 7/16" staples. None of them use staples over 1 1/2" long and each gun will only shoot the staples it is set up for. If you are using the correct staples make sure the rail and nose peices are clean and the feeder shoe and staples are riding freely on the rail and the feeder spring holds them firmly forward in the gun. Lastly check the tip of the driver to make sure it is square, it should not be rounded or have any chips out of it.
When you lift up the top of the stapler (as though you are going to put staples in), does the pusher slide freely back and forth? It might be getting stuck at some point and not pushing the staples (either due to a worn pusher spring, or friction). First (after removing the staples) try spraying some light oil on the mechanism and lifting the top part of the stapler up and down a few times and observe how easily it moves back and forth. Also, with the top open try GENTLY sliding back and forth a little - if it slides fine with no sticking, try loading staples and using stapler. If it slides ok, but doesn't quickly return to it's "normal position" when pulled so as to put tension on the spring, rhen the spring may be worn and need replacing.
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