Bullpup Saiga Shotgun
CenterFire Systems sell a Bullpup stock kit for AKs:

The AK-47 Bullpup Stock has an overall length of 27″ and weighs 7 lbs. when installed on a rifle
Chibajoe at saiga-12.com installed it on his 20 gauge Saiga Shotgun.
Very cool.

So was there any tweaking involved to make this work on a Saiga12?
Lifa Rettur og Deyja Vel,
Mikel
I am sure you can, but I do not know how much work was done on that 20 gauge shotgun to make it work with the AK kit. There are differences between a Saiga and a AK.
Is a saiga 12 compatable with this system?
The problem with fitting the stock to a Saiga-12 is that the barrel interferes with the trigger. The only way to make it work would be to make a different trigger linkage system. The barrel on the 20 gauge is just small enough that the trigger can be made to work with lots of grinding and drilling.