Why not just re-jig a Maruzen M1100 system to fit inside an AK receiver? The system's a bit underpowered, but if you're mechanically inclinded enough to do the shoehorning, then you should be able to fix the bugs in the system to be a high performance semi auto airsoft shotgun.
(I tried it once, but gave up cause I wasn't mechanically inclinded enough to beef up the Maruzen semi auto system, plus the fps on those things SUCK as stock. Also, you'd have to develop a feed system since the loading tube would be elminated and Saiga's use a mag)
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