Firing pin not retracting far enough to allow nails forward

most probably a faulty firing pin, but I recommend you visit the attached link, it worked for me with my sporadic firing Im 250. Fixing Paslode gas framing gun that wont fire or fires intermittently

you might have to clean the firing pin, it may be covered with powder residue..

is the cylinder really dirty, if so it needs a thorough cleaning. your instruction mnual detailes how to do this. also look for a jammed nail in the nose area and possibly a bent driver.

I know this post is old, but nothing worked for me until I tried the following.

little plastic triangle pin that fuel cell tip plugs into was somehow plugged in to far. pull that out, plug in gently, retry nailer.

Did you remember to lube the upper cylinder, lg 0-ring and silicone the striking pin----sticking may prevent returning to firing position

please go to paslode.com and take a look at the gun's schematic. you have one of two possible problems. check the compression on the pin's piston( it should have 2 metal rings) put the piston at the top of the chamber and let it go , if it drops by itself you may need new metal rings. the other fix is to replace your reed valve( it kinda looks like a comb with four fat teeth) sitting right under your muffler

This is an easy fix luckily usually it means that the chamber is dirty and all you have to do is open the top front of the gun so that you can see the piston then take a q-tip and clean the area really well sometimes it requires a degreaser and then when you think that you have it clean make sure to lubricate the chamber really well with the paslode lubricant that came with the gun or they sell it right next to where you get the nails. Then the gun should work fine with no problem if this does not work then this means that the piston might be bent and that could turn into a big problem but is still fixable just harder.

Hope that this works for you

Hi,
Probably needs cleaning. You`ll need two new o`rings.

not real familiar with the gun in question, but when i have that problem with my Senco guns I usually make sure the nose is clean of gunk and spray some WD40 up the nose

Check the anvil guide for damage first (ie: burrs, nicks, etc.) Then go to the chamber for the return spring. That is where your problems are.