Porter Cable,C19 886113, PISTON STOP

This fits the FN250A. If your driver won't retract/reset after each shot, thisis probably the issue. I opened mine and the old unit was shattered into dust. I assume since it was 10 years old the plastic got brittle. This fits perfectly and returned my nailer to new functioning. A word of caution, When disassembling, take a photo of the order of the o-rings and seals. The parts diagram isn't real clear for the location of the Check Seal. I'm not sure I got it right or not, but it works perfectly. Note, you only receive the part no instructions or diagrams. Google the diagram and make sure you get the right model number, there are three FN250A, FN250B and FN250C which are all different.

Bought this instead of a top end rebuild kit. My 15 year old FN250A works like new again. This is an easy past to replace (if you keep your nailer in the hard case, you only need the largest Allen wrench). Remove the end cap and, if you find a pile of plastic mush, this should be the part you need. Clean out the mush and check for any scarring or o-ring damage. An exploded parts diagram (like the one on Porter Cable's site) helps with the reassembly.This part seems to be designed as a planned point of failure, protecting the rest of the system from much more expensive (and dangerous) failures.If you remove the air deflector when cleaning out the plastic mush, be very careful not to lose the tiny spring and ball that lock the deflector in place.

When my T-nailer stopped resetting I at first figured it was toast. But a little research quickly focused on this part. It is a lot cheaper than a new nailer and looked easy to install. The hardest part was breaking loose the head bolts that are installed with thread lock. But with decent hex wrenches and a good assembly diagram, it was about a 20 minute job and a successful one. The T-nailer works like new again.

Perfect fit for my porter Cable F250A finish nailer, bought it thru Warehouse Deals and saved a few Bucks! Very easy to replaces. If you ever shopped the Warehouse deals you know most of the time it's just repackaged that's all. But this was just one item in a bag, but I say watch out for items that have a lot of parts when it says repackaged. But so far I have had very good luck buying quite a few items this way and there's nothing wrong with items but being repackaged. Thru the years of doing so has saved me quite a bit of money, like a front deck Wise Bass boat seat that was selling retail for over $275. bucks and I caught it being the last one for $79. bucks shipped 2 day prime just in time for weekend fishing, dog gone nice seat and matches the rest of the Javelin boat seat that were 15 years old! lucked out at the right time, only thing is the Wise Boat Seat Factory isn't but 2 miles down the road or less from me and I couldn't buy it from them for that price! Check out Warehouses deals sometimes, you maybe find what your looking for and save some serious money most of the time.

Got it in a timely manner fixed the nail gun, no problem , exactly what I was looking for to finish our roof

Fits & works

I also have a Craftsman Finish Nailer that stopped shooting after the first nail. The driving rod/pin would not retract after shooting. Disassembled the gun to find the plastic piston-stop completely broken into pieces. Part number thru Craftsman was #4357.00 which is no longer available. I read a few reviews stating that this would work in my model Craftsman gun. It worked perfectly!!

Fixed up my FN250A to perfect working order again.Installation took about 20 minutes, most of which was cleaning the old bits of plastic from the inside of the piston housing of the nailer.To anyone buying this, I recommend digging up an exploded diagram of the nailer online before attempting install. When the old piston bumper shatters in the nailer, it did so in my case so badly that I couldn't tell how parts were supposed to fit. The diagram helped.