... a three-inch long bit of 0.177 rifled barrel?

Ideally 6mm to 8mm OD for a pistol project I have been working on. Something from an old Gamo pistol or similar would do the job, I am going to trim it down to 63mm length, so as long as it is bigger than that, I will be happy.

I had a quote for one to be made from some scrap barrel, but at £30,it is a bit too much for what this project is.

Cheers,

Mark.