Barrel Pivot

I have a 440 Hunter tuned by CDT.  The gun had been a nail driver at 35 yards, but suddenly started shooting all over the place.  I noticed the bushing where the barrel pivots now has a lot of free play in it.  I tried tightening the shoulder screw, but it still has play and the barrel does not seat in the same way each time.  The result is an un-shootable gun.  Is this bushing a normal wear item on Gamos ?  Do you have to order one from Gamo or can it be ordered somewhere else ?  Any advice would be appreciated.

[CharlieDaTuna]

I'll give you a call Mike