So I emailed Henning and he said the Armory Craft and Floyd’s magwells would work with his 140 extensions 23+1. Bought his extensions about a year ago.
My buddy tried the AC and they wouldn’t work. I bought the Floyd’s and they worked but when loaded with 23 in the mag and one in the chamber, it was a very tight fit. You really had to slam the mag in there for the mag release to click in. I ended up buying his magwell compatible extensions and they work perfectly. Can even do 24+1 with the rune follower/spring.
And I really do like the Floyd’s magwell, it’s a good size.