The concept not being new I was referring to is the neostad 12.
That kushnapup thing I put there for curiosity and to see that there are always possibilities whether they are more advanced concepts like the keltec prototype or not. I never said anything about this is doable or not or whether it is reasonable technically or business wise. (vaporware only applies to software. Maybe a proper ready word should be "vaporhardware" or something like that).
I think that the bullup in any AK, AR, M1A or others has some fundamental limitations as any attempt in any system that is not designed like that from the ground up.
Anyway, last year I had the opportunity to use a nice saiga 12 bullup with a connector plate with a pretty nice trigger and magazine release control.
I don't have any pictures from that day but that conversion looked pretty similar to this one....
http://www.thefirearmblog.com/blog/2008/08/29/bullpup-saiga-shotgun/
Even with the obvious issues the system is as reliable as the saiga itself so that part doesn't need to be further proven.
In regards to Keltec I have lots of faith in them. I own several of their products (the same as the saigas, ARs and others) and had nothing but good experiences but some products are better than others, just like any manufacturing company.
Only time will tell if the shotgun concept will catch unlike the neostad that was plagued with bugs and never were fully resolved. Also the OAL in relation with specific state laws needs to be factored as this might not be commercially viable in some <delete> states, at least for the average firearms owner without a special license. Even if it is not the OAL <delete> politicians will come up with some bogus arbitrary clause or scheme with a limitation or something in order to skip the 2nd amendment.
Cheers.
E.