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Hatsan sortie not cycling with donny fl barrel end adaptor

I have a brand new hatsan sortie. Put the donnyfl barrel end adapter on it and now it doesn't cycle semi auto. Took it off and checked/lubed the spring. Still the same. Will shoot single shot bolt action style ok but I bought it because it it semi auto. The bore diameter is smaller, too much back pressure?? Any advice would be greatly appreciated.