gunrunner I'm not sure on the 5 rounders. Theres the Bulgarian poly 10 rnd that should work in your 223 Norinco. I'll keep an eye out, but can't remember seeing any. You could pull the base plate and make a wood plug and stuff up there to limit a 10 to 5rnds. most state hunting laws will allow you to put a plug in the mag. You could also pop rivet stops on a 10 like Canadians.