Help with HPA Barrel band

[kar120c]

I bought this barrel band http://www.hpasports.com/crosman/1-13xx-pump-arm-pivot-barrel-band-with-fiber-optic-front-sight-black.html but I realized it is for barrel longer than stock. I think it is necessary this adapter http://www.hpasports.com/crosman/27-13xx-barrel-spacer.html to use it but it in not longer in stock. How can I do to use my barrel band, any suggestions?

[BillK]

I've used an O-ring around the small end of the 13xx barrel that can slip into the barrel band.  I don't remember the size. 

[kar120c]

I've used an O-ring around the small end of the 13xx barrel that can slip into the barrel band.  I don't remember the size.

Ok, tnx that's an idea. The barrel fits well locked and doesn't affect accuracy?

[BillK]

Using a steel breech I would think there for sure would be no movement.  Using a stock plastic breech there would probably be no movement.
I dont think you could tell if its moving or not shooting off hand or on a bag rest with open sights.  The POE would be so close either way.