I have a Saiga SGL12-03, 12 gauge shotgun. This is how it looked when I got it. In the following weeks I began customizing it. No real gun smithing. Just swapping out furniture.
I started with a new adjustable stock with pistol grip, a drop-fore-grip, , new trigger, hammer and spring assembly. Then I will be getting some of the highest capacity magazines available. Enough American parts will get exchanged to ensure 922R compliance. It's actually kind of funny that compliance kits have become market.
Breacher Muzzle Break.
--This thing is a shit-storm as is. More later as upgrades occur...