So I finally scored a ks-47 from psa and it should be here next week. I like to have spare parts but psa is currently sold out as usual. My question is, will any 7.62x39 ar extractor fit their bolt and if not can I use another type of 7.62x39 bolt in their hybrid bcg's. I'm newish to this platform but have read their bolts and extractors are the weak points in these rifles. I would buy the whole bcg but as stated earlier they a continuously sold out. Thanks for any info. It's always appreciated.