Finding real steel rail for M4

Hi people,
I was wondering any shop in hong kong sells real rail for M4? I'm looking for DD M4 rail 12' (The one being used by US Army's SDM-R) and DD M4 RIS II (Long version RIS II, the one for M4 not MK18)
Online stores are also fine with me, but is it legal to import real steel rails to Hong Kong?
Thanks in advance.

Links for the rails that I'm after:
http://www.danieldefense.com/?page=shop/detail&product_id=24
http://www.danieldefense.com/?page=shop/detail&product_id=17

just search in CGF's "2nd hand street"
someone is selling it