Hey guys! I’m brand new to the forum so hopefully I’m posting this in the correct spot. I’ve been a bushmaster ACR owner for a while now but I recently purchased a 6.8 SPC conversion kit. From what I’ve read 6.8 seems to really stand out in an SBR configuration compared to other cartridges. The conversion kit I ordered is a 16.5” barrel but I was thinking pretty seriously about having it cut down to 12.5” and re-threaded. I don’t have the conversion in hand yet and information online is limited and conflicting. From my research the best I can tell it is chambered in SPC II and the twist rate is 1:11”. Not sure how 1:11 would perform once cut down to 12.5”. Also, being new to the cartridge, I’m wondering what types of 6.8 are safe to use with my rifle and which types are not safe. I have been trying to research as much on my own as I can but it seems there’s a lot of conflicting information out there and very little details on the ACR when chambered in 6.8. Any advice would be appreciated! Thanks guys.