Rossi arms can i buy a rifle barrel to fit my shot gun ?

Contact the manufacturer for this information - or Pyramid Air, they are the experts in air guns.

Lisa try one of the links below.
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Guns for Sale Online Gun Auction Buy Guns at GunBroker com

http://www.nramuseum.org/media/940941/serialization-date%20of%20manufacture.pdf

When Was My Gun Made Firearm Dates by Serial Number

http://www.gunpartscorp.com/Products/745920.htm

Go to your local gun store or request one here:

Catalog Henry Repeating Arms

Mount the rifle with the scope and make a mark on the backstop right where the crosshairs are pointed at

Shoot several times, several shots will surley jolt the scope some.

If the crosshairs have moved much past your mark then this would indicate the scope is the issue.

If the crosshairs are still pretty well centered to the mark, its not the scope.

If at the same time your grouping looks terrible, and your scope still is on the mark, and the gun is WELL mounted, then the issue is with the accuracy of the rifle.
Make sure the rifle is mounted good for this to ba accurate .
Hope this helps

Are you trying to say it will not c.o.c.k.? (dang sensors.) If so, you have to slap the barrel pretty hard toward the front or tip of it. Hold gun firmly and bang that barrel good with the palm of your hand. It should then break open the barrel and be ready to load and shoot again.