11-87 fail to fire

Replace the Firing Pin Retractor Spring.
Check the pin on the locking block, that it is there and that it it solid.
Clean the ring under the barrel, the inside, scrape all of the carbon out.
Use a factory "O"-ring, or make sure that the "O"-ring is the same dimension.
Check that the Piston and Piston Seal are properly installed.
Check that the Forend Support is not broken.
Clean the recess in the barrel that the locking block pivots into.
Clean the Action Spring Tube.

Replace the Firing Pin Retractor Spring ~ yes really.
 
update

Its been a while, but I didn't bring the gun in planning on replacing the pin retractor spring. Everything was fine. The spring looked exactly like a new spring in the package. It is supposed to have the compressed area in the middle of the spring. I just got back from a 4 day goose hunting trip and everything went well. Maybe 1 or 2 poor extractions. Now I'm going to take out the recoil spring in the stock and clean things up, but overall I was very happy with the gun, just needed a little cleaning I guess. My buddies 1 year old Beretta Urika 2 had a number of fail to extract problems, so I don't feel to bad with my Remington.

My Dads 1960s 870 stopped firing so when he gets back, thats our new project.
 
Someone else mentioned it but, make sure the ring/collar is installed on the mag. tube correctly and not backwards.
 
For lube with a gas gun, I find BreakFree CLP amazing, especially on the gas rings, cylinder and magazine tube. Regular lubes will get baked and carbon gets hardened onto the mag. tube. BF CLP keeps the carbon in suspension. I shoot it wet, and it basically cleans itself as you shoot. Other modern synthetic lubes may work as well, I just have had good success with this and haven't found a need to try anything else.

Yes, inspect and clean the spring in the magazine. I'll guarantee it's crudded up significantly. You may even need a fresh spring in there.
 
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