Question about Stanley Bostitch F21PL Nailer

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The contact head came half way out. When I turned the gun up side down, it fell up into the body of the gun. HELP!!

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Sounds like the plunger has broken, four allen head screws on top of gun remove and pay attention to each part and how it comes out. not hard to replace if you want to attempt it. just lay the parts out in the order removed and clean and oil then put back in reverse order.

Posted on Feb 02, 2010


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If a gun is firing and nails are not being driven into the work it's because of one of two problems. The nails aren't feeding fully under the driver or the driver isn't fully retracting each time the gun is activated. Is looks like you've eliminated a feed problem so you are going to have to take the gun apart to find out why air is not being held in the bottom of the head long enough to push the driver back up the cylinder. Go to and bring up your model so you can follow along. Remove the four screws holding the head cap on. The things that can cause your problem are: the piston seal & o-rnig are damaged, the cylinder is badly scored, the o-ring & cylinder ring on the bottom half ot the cylinder are damaged or out of place, or the driver guide under the bumper is broke or missing. If it turns out internal parts are damaged or missing, I highly recommend the overhaul kit to replace all the 'soft' parts inside the gun as long as you have it apart.

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1 Answer

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1 Answer

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