the only REAL russian AK style gun you can get is a Saiga rifle in 762x39 or 308 or a saiga shotgun in 12, 20, 410ga
they are sporterized with black plastic monte carlo stocks and only the 762 model can accept(with modification) to use hi cap AK mags
they are real nice guns starting at around $300 and up to $550 for the shotguns
but a real good way to go is a romanian SAR, those are in very good condition, dont discount the cheap maadi rifles either, they look like junk but can be cleaned and refinished to look very nice -- a nice side project that many AK owners have done with great results
there are also single stack AK guns which only use single stack 10 rnd mags, they are under $250
mak-90s are excellent guns also, dont let the chinese manufacter fool you, i wish i would of bought a bunch of these years ago
also the SAR and Saiga rifle/shotguns have a side rail to mount optics and russian red dot sights -- which are Bitchin accessories
to put on a pistol grip on the mak90 i think you have to put on 6 US parts, the SARs already have these US made parts -- read AK.net for more info