[hermanpj]

Had same problem with my Remmington 11-87. I had it perfectly clean and it would not cycle.

Replace the rubber O ring for the gas operation system. They get old and get little cracks in them, get brittle... in short they stop sealing properly.

I relaced mine and my 11-87 worked perfectly from that point and cycled ALL types of shells regardless of load or length. Hope this works for you. I ended up selling the gun after a few years, never had to replace the O-ring again, but I think its common to do this every few years depending on how often you use it.