So as most of you are aware, I'm building demo rifles that showcase the range of products you can buy in my webstore. I'm just about done with the first one...the upper is with Sardie being photographed but the parts list includes: 14.5" ATAC GPU built on a VLTOR MUR Noveske N4 lower Armalite LPK Geissele SSA Black MIAD Black ACS Enhanced trigger guard Armalite buffer tube LMT spring and heavy buffer Troy folding HK front sight and folding rear battle sight For the second build, I was going to do another black rifle but with a 16" ATAC GPU on a standard receiver and UBR. I'm starting to reconsider and going the FDE route. I might also go with a 6.5 Grendel instead of 5.56 however from what I'm told, 6.8SPC outsells 6.5G five to one even though 6.5G is the superior caliber. So what would you do??