We just got approved to carry SBR's and some other new brands at work.  I have four awesome choices but cant decide because there all great rifles.

Sr 15 e3 11.5

Sr 15 16 inch

FNH SCAR or Bushmaster ACR 16 inch.

They have to be factory SBR's and cant be form 1.  

As far as I know they dont make the SCAR or ACR sbr available to civilians yet and a LEO purchase from my understanding is directly to the dept and not the individual or i would go with the SCAR or ACR SBR.  

Lucky You.  We've been asking for rifles but its not happening.  Forget the 11.5 in you loose too much velocity.

If you are getting in and out of vehicles, go with the 11.5".  I can hit with mine out to 300 yards just as easy as 16" rifles.

Go with Sig.