I'm, personally, not really into the smaller calibers. I just never cared for, or had much use for the 5.56 or even the .222. Also, I usually prefer the M-14 type actions being a Lefty, but the 6.8SPC really caught my interest, so I broke down and purchased an AR (STAG Model 5L). I recently came across an interesting upper at Combat Solutions (http://www.officialcombatsolutions.com/) and was wondering if anybody had any impressions of it, or the caliber? Here's the link: http://www.57center.com/ As a Lefty I like that is ejects straight down, through the magazine well, and not in my face.