23 Round extension for Shotgun @ Brownells

Does it automatically advance to the next cylinder when one is emptied? If not, i'd say you could probably put 2 in each cylinder. You'd have to manually change tubes, wouldn't you? Kinda like duct taping 2 5/30 round mags together :)
 
Speaking of rotating shotgun magazine... what ever happened to the SRM?

gun-photos-2-08-024.jpg

I want one. haha.

What's the status/background on this?
 
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