So I have sold myself on the grendel. And have spent the better portion of my deployment collecting the pieces to get it together and right. However, I seem to be stuck on a "spr" kick. And have ordered an 18" barrel from Alexender arms. Does anyone run these? What is the general concensus on them. I'm really thinking about ordering a 24" as well and putting it with a magpul PRS stock. I have the guts for almost three rifles. (lots of projects for when i'm home again) I'm just courious what the boards here think about the gren, and what barrel length is optimal. No specific purpose really.