ABC internal failure
If there was a good pea sized chunk of shiny aluminum debris in the engine its not a peeling liner. The liner would flake off in pieces so small it would appear like dust (if you could even see it) and the liner material is dark grayish in color. Also, you would see exposed brass on the sleeve.
Its funny how OS continues to get bashed for peeling liners on all of their engines. I though the problem was only the .46 and solved a couple years ago? For what its worth, I have a 46FX bought about 2 yr ago and have had zero liner problems with it. I run it hard too - 11x5 turning about 13-13.5k on a fun fly.
Just MHO. Flame suit on.
Jeremy