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I just tried dropping a Feddersen into my Volquartsen receiver and was surprised it dropped in w/ no finessing. I pulled it and through the calipers on the tenon - .6860". Am I expecting too much wanting a better fit, or is that par for the course?
so your barrel is within spec......honestly, once that is tightened down, im not really convinced the tightness of the tenon fit is really having much of an impact on accuracy.