A short analogy if you will...
Guys, look at your saiga 12 like a used car you just bought to restore. You have lots and lots of options, the canvas is blank but if you bought it turn it into a hot rod you have to pop the hood and rebuild the engine.
Saiga 12 is the same way, if you want it to "run" smoothly and "start" every time you pull the trigger and accelerate to "60 in 4 seconds" it is undeniable that you have to have your bolt, trigger and BCG reworked (polished) /(tuned) for maximum performance. Sure, you can dress up (paint) the outside, hang all kinds of "cool factors" on