True - but you could also include "Through Lumps" in that list.

There were also some barrel jointing systems that did not employ "welding" at all(i.e brazing/soldering)at all. BSA used a system in which the Chopper lumps were coupled by a vertical dovetail and pinned. This system was also adopted by Winchester on their Model 21 Shotgun.

BTW - it's probably a bit misleading in terms of strength to "lump" Monobloc(demi-bloc) barrels in with Dovetail Lumps!

Also - a few of "Quiz' questions for the members;

1/ What is another name given to "Shoe Lumps"?

2/ How did "Chopper Lumps" get their name?

3/ Which British maker used the Monobloc system?