Symptoms
- Staple gun won't fire or fires empty
- Staples come out bent or only partially driven
- Gun feels stuck mid-stroke
- Loud clunk with no staple ejected
Likely causes
- CommonWrong staple size or gauge loaded for the toolUsing staples not rated for the specific gun causes misfeeds and jams.
- CommonBent or damaged staple stuck in the trackA single deformed staple can block the entire feed path.
- PossibleDebris or old staples built up in the magazineDust, wood chips, or staple fragments accumulate and disrupt smooth feeding.
- Less commonSpring tension too weak or magazine not fully closedInsufficient spring pressure or a loose magazine door prevents proper feeding.
What to do
- Unload the staple gun completely by removing the magazine or spring-loaded follower.
- Inspect the feed track for a bent or stuck staple and remove it with needle-nose pliers.
- Clean out any debris, sawdust, or staple fragments from the magazine channel.
- Confirm the staple type and size loaded matches exactly what the manufacturer specifies for that gun.
- Reload staples carefully, making sure they sit flat and the magazine or follower closes and locks fully.
- Test fire into scrap material to confirm smooth feeding before returning to the project.
- If jamming continues with correct staples and a clean track, the internal driver blade or spring may need replacement.
Tools and parts
- Needle-nose pliers
- Correct staple size for the gun
Replacement staplesSearch: “staple gun staples correct size and gauge”
When to call a pro
Not typically a professional repair; a jammed or worn-out staple gun is usually inexpensive enough to replace.
Safety
Use caution
Always point the staple gun away from yourself and others when clearing a jam, and never look directly into the muzzle.