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In my tests, the plastic BELL/Poly stock liner did NOT allow several of my Norinco rifles to "drop in". The NEW 2009 POLY stock liners need a small amount of grinding at the lower front edge of the bedding surfaces before they will take a Norc receiver ... there seems to be a short section that didn't get the cutter all the way down.
No big deal ... take the stock liner out, and a few seconds with a file should allow all M14 receivers to fit.
Can you show me where I have to file down ie picture please
I am having the same prob. And cannot see where.