Sorry for the cold link. M nert kumputer smrt.

http://www.google.ca/patents/US8584391

I don't see how it would save weight an how the barrel wouldn't tend to try to violently extend on firing. Also can't see how there wouldn't be gas escape. You couldn't keep a uniform bore diameter all the way down in a telescoping tube.
Mostly I can't see how the guy thinks that the length of the barrel alone determines pattern and not choking as was a reason stated in the patent, or how this would be lighter/as durable as a standard fluid steel barrel of a fixed length.

Lots more inventions from said inventor
https://www.google.ca/search?tbm=pts&hl=en&q=Smill+calvert&gws_rd=ssl#hl=en&q=S+mill+calvert&tbm=pts

Thoughts?

http://www.google.ca/patents/US8584391

https://www.google.ca/search?tbm=pts&hl=en&q=Smill+calvert&gws_rd=ssl#hl=en&q=S+mill+calvert&tbm=pts

Clever, but would only work fully extended(does have locking pins to hold bbls @ various lengths), and would be no more effective than the original short bbl, so a bit pointless.

Much obliged for hotlinking!.
I haven't looked too closely, but wouldn't the sections have to get progressively bigger the more you move towards the chamber end? That means they'd have to be grossly over bore diameter to accomplish the telescoping of the forward sections. There would be virtually no seal behind the charge. Also, there would have to be at least a beveled edge or forcing cone upon entering each successive section, and a narrowing incrementally of the bore. If he thinks shotgun length is what tightens patterns, I'd like to see what he'd think of his patterns after the shot column was butchered going down that tube.

Yeah, he doesn't understand how shotguns work.  But apparently he went to the expense of getting his idea patented.  Are they patented only in Canada, or also in the US?

Not sure. I only stumbled on it to research an experimental telescoping style shotgun case I read about that had virtually no noise on firing. It's odd he had the knowledge to write up the patents, but did you see his others? Equally silly, like a 12 year old thought them up.

Quite possibly the dumbest thing I ever saw

LOL same guy also made a "human breast platform" according to google.

That guy is a moron

The way he's got it designed is the sections get a larger diameter as you move towards the muzzle. Dumb as hell.