Really hope this will save time for someone else having similar problem. Lesson #2: stick to original parts when possible and not something fishy from ebay It makes DeWALT DWFP12231 a very convenient and safe brad nailer to use. Also, itвЂ™s rear exhaust prevents the nail kit from damaging the work surface and keeps any external contaminants away from your work area. Lessons learned: never try to fix something which is not broken. The DeWALT has equipped the DWFP12231 18-gauge brad nailer kit with a life long maintenance-free motor. Ironically this part was the only one missing at DeWalt dealership, so I left the ebay one in (it was still new so why not lol!) when replacing the o-rings the second time.ДЄfter I put in the original o-ring back where it was, the nailer is working as new. Hence the air found its way out through the exhaust instead of moving the piston. Apparently the new o-ring caused the cylinder sease and not allow the air in when trigger is depressed. Sold by SpaceShift and ships from Amazon Fulfillment. Uses 23 GA headless pin nails from 5/8 in. Low nail lockout with bypass and reload alert.

Oil-free operation reduces risk of oil stains on work surface. Tool-free depth adjustment for driving recessed fasteners. I though the original just extended and worn out, but I was wrong. This item: DEWALT 20V MAX Finish Nailer, Angled, 16GA, Tool Only (DCN660B) 299.00. World's first 23 GA Pin Nailer with tool-free jam release for easy nail removal. Most guns have a flip-style mechanism on the nose that allows. Not every model has a lever, though, so if there is no lever, open the magazine on the nailer. If your nail gun is so equipped, this will allow you to release the jammed nail, ending your repair effort right there. So when I installed the ebay O-ring kit I did not pay attention that the oring which seals the cylinder to the bulkhead (the black plastic piece between the cylinder and the nailer body) is somewhat beefier and thicker than the original. Look for a release lever on the nail gun. I spent hours looking at all nailer parts while assembling and disassembling it until I found this. Here is what was the problem, hopefully it will be of use for someone. Sure thing I do disconnect the air house while not using the nailer, sorry if I forgot to mention that.

Dewalt nail gun jam