What causes fasteners to jam in the SB-1664FN, and how do I fix it?
Fastener jams can be caused by a worn driver channel, wrong size or bent fasteners, loose magazine or nose screws, or a broken/chipped driver. Corrections include replacing the nose and checking the door, using only recommended fasteners, tightening all screws, or replacing the driver.
From the official Bostitch SB 1664fn manual, page 12
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