Originally Posted by
Bergeron
That was a great video. I'm very pleased that the civilian market is still on Sig's mind. Regarding the cartridge, you can see it has some recoil to it. While I have my doubts about the 6.8x51 carbine being anything other than a DMR sort of rifle (which it could bre really good at), the 6.8x51 belt-fed really looks like a winner.
While I certainly perceive a lot of good things about 6mm ARC, I don't think it's the total answer, either. The 5.56 AR-15 bolt is already hanging out on the edge of long-term durability, and the larger 7.63x39-compatible bolt required for the ARC & Grendel has some very thin walls. The rounds are also not going to allow any AR-15 PMAGS, and require the use of metal magazines. While an "AR-12.5" sized carbine could address both the bolt and magazines, I haven't heard or seen anyone doing the work to make that happen.
I will admit to be being interested in a 14.5" - 16" 6mm Creedmoor, loaded at less than maximum pressure, taking advantage of the smaller and lighter components developed for the various large frame ARs.