I paid $1499 plus 7% sales tax for my Z43P. To go SBR and 922R, figure $125 for the trigger, trigger Box, sear, and hammer. Flash suppressor is $25. The US butt stock is around $130, and then $200 for the stamp. This still leaves 2 more needed parts, of which I can't find right now. MKE is supposed to be releasing some 922 parts at some point, just not sure when.
So, that brings us to $2083.93, so far. If, the new MKE rifle will be 922 compliant, I would go that route, but for the price above, I doubt it will and will probably have to use 10 round mags. I will be going for a HK33K clone.
Jason