There are many different ways to get the finish you want.
Start with country of origin. If Romanian or Soviet, the final finish is shellac. If Yugoslavian, linseed oil.
For color, I use RIT (fabric) dye, extracting the color with alcohol and filtering through a coffee filter. My son wanted his Romanian AKM done in a brownish-red, so I used red, yellow and brown dye, mixing them in different proportions until we got the look he wanted.
The stock was prepared by using alcohol and steel wool to strip the shellac, then several trips through the dishwasher to clean and bleach the wood to a reddish-blonde color.
Do a search on finishes, you'll find a lot of info and techniques.