I have a porter cable FN-250B finish nailer and I am so frigging frustrated. I have had it for about 4 years and never had a problem with it. I took it out this time and first it was shooting double nails, then nothing. I came in the house and looked the manual up. I realized I forgot to oil it so I used the oil that came with it and put it in the back where the line goes. I opened the magazine and there was a nail jammed in it. I took it out and every 5 nails it jammed again. I am not sure what the heck is going on. The manual says to clean the magazine but does not tell you how. The nails were purchased last year but I don't think they are bad. It is their own brand of nails. The manual also says to tighten screws but they are so fricking tight they would not move. Any ideas? A 3 hour project has taken me all day long and I can not even begin to tell you how frustrated I am!!

Thank you for your help

Here is a link that might be useful: a link to the manual