I added the CJ Dead Nuts to my new Liberty. I'm really impressed with the sight when I keep it in sight. I have had to re-sight it 4-5 times because it keeps moving in the bracket. It's actually fallen off twice. I am possitive I am tightening it down enough, but after approxamitly 75 shots it has moven off sight. I understand CJ has redesigned the racket with a larger "dovetail" to grip more surface area. Is this true? I just bought this about three weeks ago from Bass Pro. Could I have an older design? Any help would be appreciated.

Thanks, Gingus