I have 4 Handis now and 3 of them have great lock up, no barrel movement of any kind. The 4th one has a little side to side movement only with the forend off. I tried the fix method adding a shim made of pop can material, very thin aluminum but with it on you cannot get the gun to lock up barrel to receiver. This is the gun that is least accurate of them so I think this lateral movement is the cause. What should I try next?
thanks,
Joe