To summarize the various methods of joining barrels at the breach:

1. Chopper lumps.
2. Dovetail lumps.
3. Shoe lumps.
4. Monobloc.
5. Then you have what Winchester did with the M21 - chopper lumps that were dovetailed together.

Can anyone identify other joining methods?

What is your preference, and why?

Is there a particular joining method that you dislike?

Let's expand this inquiry to include SxS shotties, since joining is the same.

Share your knowledge and opinions.

Thanks,
Curl