It's my understanding that some Chinese parts, like the bolt, are not interchangeable. I've heard some folks that have had good luck, and some that have not (soft parts and such). I had a Chinese, and sold it. Since then I picked up a mid 90's production Springfield NM and have been very happy with it (all GI parts, exc the barrel), and also got one built with GI parts on an LRB receiver. Nowadays, my personal pick would be an LRB receiver with GI parts. LRB receivers are forged and machined, like the original GI guns. Everyone else uses investment cast receivers, even Fulton. Not that there's anything wrong with that, but Forged are still stronger and I personally like them better. Just my $.02!