I tried correcting the bend in a vice but was getting to the point where the moderator was about to break. Thinking most of the barrel was still straight I decided to simply hacksaw off the end of the barrel just before the bend started i.e., where the diameter steps down and where the moderator is cast on.

The gun was horrendous afterward - loud and firing inconsistently all over the place. After a bit of further research I realised the hacksaw fix was pretty stupid. The crown geometry is critical to accuracy.

I took the gun to Youngs and Ron said a replacement barrel was the only possible fix. The Gamo barrels have a plastic breach which means you can't heat the barrel to rebend it. If you try cold bending the thin / poor quality steel causes the barrel to crack.... He also mentioned that that a new barrel would be super expensive (about the third of the cost of the gun) if you can even find one.

Any one else had a similar experience? Were you able to fix your gun? If so how and what did it cost you? Only a gamo but was my first airgun so would like to get it repaired if I can economically.

Bummer dude 

I assume it has a plastic breech? Check that carefully for cracks. It sounds like you were kind of lucky it hit the fence, otherwise it would have bent the barrel where it enters the breech block, and with a plastic breech it probably would have broken too.

You need to have the muzzle as square as possible. Ideally you would get it re-crowned by a gunsmith in a lathe. If you are careful with a file and a square to check your work you can fix it. After squaring it, you will need to crown it. Lots of youtube on using a brass screw and an electric drill.

Barrel was bent and gunsmiths wouldn't touch it - can't be fixed they said!

So he spent 3 months with the barrel in a jig, hammering it with a rubber hammer, little by little...

Now it shoots perfectly - he just did it all by eye!!! Incredible!

And he's not an engineer!!! 

There's hope for us all, eh?!