6.8, due to the size of the rounds putting the bullet tip lower in the mag, just about requires extended feed ramps on the upper for reliable feeding of all bullet types. This isn't at all like 5.56, where feed ramps are really only needed in full auto carbines.
To the OP, I would suggest sending your upper to Adco Firearms. Steve and company do a fantastic job and are very quick with turnarounds - usually a week or less. Just go to the web site and choose Shop Services.
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