That's been my experiencewith the adaptors. We quit using them. The 'lead' (the distance from resting bullet to rifling) is so great that the poor bullet smashes headlong into the throat, gets twisted (not in a good way) and comes out the muzzle one terribly confused piece of lead, badly in need of counseling. And they always seem to go toward the 'left'. lol.When you have a hard time keeping the bullets in a pie plate at fifty feet -
May as well be shooting blanks . . .
I would have kept my conversion kits if they were this accurate. Mine usually shot about 4"-5" at 25 yards with several kinds of .22 lr ammunition. I sold the conversion kits and purchased a Tactical Solutions upper.I have no experience with any .22 unit but the Ciener, but i have owned 1/2 dozen of the Cieners and have personal experience with about that many others, owned by friends. None of them group worse than 2" at 50 yds. Frankly, I don't see how anything that fit in the barrel could group worse than 6" at 50 yds. It would have to be keyholing to group that poorly at 50 ft.