I've been milling over this since SHOT. I want a 6.8 SPC. I don't know why, I just do. Here's the dilemma. Do I get a LWRC 8" upper which will probably cost around $1,600+? Ooooorrr, do I just buy an XCR and SBR it. I have a 7.62x39 conversion for the XCR on order. And I'll switch that with the 5.56 as needed. Because of that I want a dedicated 6.8 gun. The XCR advantages we all know, it will shoot smoother and have adjustable gas system. Disadvantage is it will be considerably longer (I'll SBR it at 11") and a little heavier (which is the least of my concerns), but the length thing is big with me. I have that 9.25" POF and I love the shortness of it. And that 8" would be just wicked. BUT... the XCR will be so silky smooth.