Thread: .22 extraction issue

I'm hoping all you clever minded people maybe able to help,
I have been given a old Remington model 12 pump action,the issue is it won't excract the LR cases they come half way out then jam and the excrator let's go,but excracts the shorts OK a bit tight but does extract them,
I've given the chamber a good clean and can't see any pitting or scoring in the chamber(well as best as I can see)
Any ideas or should I just retire it and keep it as a conversation piece.
Thanks in advance,,

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