Russian and Chinese should have all parts commonality. The early Factory 26 Chinese rifles were built on Russian machinery using Russian parts. The later Chinese models used a pressed and pinned barrel, so the later Chinese barrels are not compatible with the Russian receivers. The Yugo M59 SKS is fully compatible with the Russian SKS. The later Yugo M59/66AB1 has a different gas block, muzzle and a longer bayonet than the Russian models. Hope this helps you out!