Bob,

When I saw this video (see below) I was hoping it applied to all their doubles. Is it only their bigger calibres that have the wedge?

Mine has two different types of metal at the muzzle and I thought the harder looking piece in the middle was a wedge?

If I can sort myself out I will post a photo.

https://www.youtube.com/watch?v=N_0iK8cT9wo

cheers