You have quite a few options really.
As for the Roedale, they don't have a distributor in the US.
You will have to buy direct and import it you're self.
Being a rifle stock, sent without a magazine it really should'nt come in under any special law, but I'm not from the US so check for you're self.
I get stocks exported several times a year from the US and they don't need any export lisences.
Beware of the Roedale LA chassis though as they use Roedale proprietary mags, same as Voere's LBM rifles.
But I'm certain they would be difficult to get hold of and get into the US.
As for stock and chassis choices here are the better one, in no specific order.
McMillan.
Manners composite.
Bell & Carlson.
PSE composites.
GRS stocks, (imprted by Kelby).
KRG WC 3.
XLR industries, evolution chassis.
Roedale precision chassis.
MDT LSS chassis.
PDC custom chassis.
Competition machine inc, chassis.
Third eye Tactical chassis.