TheJackal
.410
Like you said nice novelty if they don't cycle well.
Work good in a side by side.
I'd really be interested to see if they'd be reliably cycled in something like a Kel-Tec KSG or that UTAS-15 monstrosity.
Theoretically one could come pretty close to a 30 round capacity with a 1.25" shell in either of those.
Hopefully they can be made to reliably cycled through a 500 or 870 action.
I could see them finding a niche role with something like the capacity-limited Serbu Super Shorty.