Possible Kriss SBR Conversion?

So I haven't bought a Vector yet, but I want an SBR version quite a lot for my home. Maybe you guys can tell me if this would work on the SDP:

http://www.tokyo-model.com.hk/shop/taf-m4-stock-adaptor-for-kwa-kriss-vector-gbb-p-10486.html

If this did work, you add a standard M4 buffer tube, the Sig SB-15 Brace, and you've got a legal "SBR" without having to go through the ATF's constant crap. It's probably a long shot, but has anyone done/seen this done? OR if anyone has put an SB-15 Brace on their Sig, how did you do it???

Thanks in advance!

KRISS has delayed the distribution of the Ar M4 adapter for the SDP and Carbine .Was supposed to be available 2 months ago and still waiting . I tried to preorder but no Joy just wait it will be worth it . Military arms channel on Youtube has done a good vid on the Sig forearm brace on the Sig 556 classic pistol and it rocks . The Kriss SDP with the Sig brace will be hot !!!

The problem I see with that reasoning is that the SIG Arm Brace was specifically designed not for the AR buffer tube but the AR "platform". The letter that BATFE sent SIG talks about the AR Pistol, not all other pistol platforms. They have ruled them legal for the AK Pistol also. Unless they specifically say that brace is OK for the Kriss SDP, then my guess is you take your chances and build at your own risk.

JMHO,
MadDolg