I have a Stevens 200 .223 that gave me fits out of the box. 6+ inch 100 yard groups, followed break-in, then at round# 50 it started to tighten up. After round # 80 it groups < 1/2 inch with Fiocchi 50 gr. vmax. Running a patch down the bore still feels & sounds like a zipper.
That was with the tupperware stock, barrel floated, never checked the tang.
Mike
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