67rs, I'm not much help but, I have a 6mmAR-P barrel from ARP on order. I researched it for a while and decided to go that way. I have a Super bolt and gas tube coming from H also. My barrel is melonited so it might be hard to ream it out to T40 but we'll see. I went with the 6mmAR due to the case being shorter, read grendel case, than the 6.8 versoin. (Don't get me wrong, I have two 6.8x43s right now, 18" & 12.5".) So its not the "mines longer than yours" mentality, I just wanted the option to use up to the 105/107 bullets. I didn't want to go with a 6BR because I already have two 6mm-284s for the top end gun. I hope to learn from some of the answers you get here too. Jerry






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