They're just Bulgarian take-offs... I've got fixed portion, too, but the rear is a folding Magpul Zhukov stock. It's somewhat of a mutt, but thanks to Obama its worth more than my AR, as its a converted Saiga 7.62. The rear sight is a Tech Sights peep. It has a special dust cover, and the rear sight portion replaces the rear part of the recoil spring guide which locks into the rear trunnion. Taking the cover off is a little more of a hassle, but not a big deal so long as you've got a bullet handy. I like the feel of the wood handguard, and also shoved the heat shield from a set of KVAR AKM handguards inside for a little better function, too. It does not have the proper AK-100 series FSB or gas block because I never tracked down the proper parts, because at the time I converted it it wasn't worth it in my opinion... It's sporting a bolt-on handguard retainer for the same reason, as you have to press off both the gas block and FSB in order to affix the proper AKM retainer.
I also kept the Saiga specific mechanical bolt hold open (its that curious metal tab right in front of the grip), because its handy. It's a straight pain in the dick to get back together if you ever pull the FCG out, though. The best method I've found to get it back together involves dental floss, haha.