I am fairly sure SBR are not going to fall under the ban, assuming there is one. Actually I am almost counting on it. Also if they are, then the ATF will just have to meet that deadline... Otherwise I just see to many lawsuits coming. There is just no way a judge is going to side with the government that their slow processing of paperwork made it so you could not buy a gun.
I just like PTR better. I have seen a bit of vector and it would not scare me away but I have seen them with a lot more issues then PTRs... almost none there. PTR is the gold standard of US made HK91s... which all others must compare.
See Farmer v. Higgins.