Rough Side Charging!!

[Rockdriller]

Hi folks, this is directed to all the grendel owners with the AA side charging billet upper. When I try to cycle the BCG into the rifle length buffer tube there is a ton of gritty resistence. I have a wolff Xtra power spring and standard rifle buffer in the tube. The BCG is the young national Match that is sold through AA. I can't figure out why there is so much resistence. Has this happened to anyone else?
Thanks for any advice
Rock