Thinking this might make a good sort of SPR but i would also want a railed FF forend.Any suggestions?

I believe this is still an unknown at this point.  As far as I know, no one has gotten a definite answer on whether the AR-10 barrel nut threads are the same as the Bushmaster 308.  This would be a good question for Bushmaster.  Although I could be wrong....

I would say if BM is not going to make one soon then your best bet would be SniperX. He and a friend of his started making them for the Armalites and recently started making them for the DPMS LR308. I would say once the BMs start getting out there in numbers, he  may start making them. I must say his rails are top notch and I'm glad that I have one. When I get around to making that "AR-10K", it will be wearing a tube from SniperX!

BM says this year they should have something,but you know how that sometime goes and if Kerry and Ewards get their way you may not be able to buy anything semi,so i'm worried about waiting around for BM.Those are my thoughts.Can i get a link to sniperx?Thanks.