My Cannon has gone

I was firing it and accidently clicked off the game, wen't on the game again and the cannon is not in my inventory?

Is it gone for ever?

 

Go back to the same world you had it out on, you should see it there, please hurry you might not have enough time.

 

I think this is how to get it back:
http://bestrunetips.com/blog/runescape-items/lost-cannon-in-runescape

 

Talk to the guy who sells you cannons if you lose it, he gives you a free one.

 

I bought it from Grand exchange as a set though, and this happend last night as i clicked off as i was goin to bed just woke up now and it was gone

 

Did you set it up, as in put it on the ground ready to shoot?

 

Yeah it was shooting i clicked off the game

 

Just went to nulodian and he has replaced it for me,
Cheers guys!