Porta Nail Model 401 stopped pounding nails
First thing to check is ensure there is not a jammed cleat in the nose or magazine preventing the nails from advancing all the way forward.
If that is not the problem, most likely you have a broken driver blade (Part #33 on the breakdown)
https://www.qepparts.com/porta-nails-401-hardwood-floor-nailer-parts.html#3317_1
SOURCE: porter-cable plunger extended and will not reload new nail
could be a jammed nail in the nose assembly, try removing all the nails and dry firing. If still the same after making sure nothing stuck in the nose, you probably have an issue with the firing valve or piston.
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