Got a question about these, if you were to get a M4 stock tube adapter, like ones from Vltor:
http://www.vltorstore.com/products/A...k-Adapter.html
Will that work? For RS the Vltor one is stated to work with stamped AK receivers only, not the milled ones. On the same token, the rail system from Ultimak also have the same distinction:
http://ultimak.com/ACR2Long.htm
Does the GHK fit the spec for a stamped or milled receiver?