Swiss Arms SG 553 R (7.62x39)

[Bret]

I have the pistol version of the Swiss Arms SG 553 R in 7.62x39 on order. I really like my Sig 556 SBR, so this one should be fun too.

I'm told it should arrive around January. The gun shop that I'm purchasing it from will also have the buttstock available. I know that a good number of the pistol versions have been imported in 5.56x45 and made in to SBR's, so I'm wondering what everyone is using for compliance parts. Obviously I can use a US made AK magazine, but what about the US parts beyond that?
http://www.swissarms.ch/en/sg-553-r-assault-rifle.php

BTW, I realize some will say that sec922(r) compliance parts are not required for SBR's and I agree according to the text of the law. However, the ATF in their infinite wisdom has more recently said otherwise, so I'm not looking to get in to that debate. I'm just wanting to know what those who are using compliance parts have installed.