I'm looking to get a 6.8 upper for a DIY assembly. In my price range (<$600), I can find mid-length with 1:10 twist, or I'm finding carbine length with 1:11 or 1:12. After my crash research efforts, it seems the ideal set-up would be mid-lenth with 1:11, but I'm not finding those in my price range. My gut is telling me to go mid-length and live with the 1:10 twist, but I'm wondering what is generally more important for performance of the 6.8 platform? Am I making too much of one or the other (twist vs. gas)? Is it a wash if one or the other is not "ideal"? Thanks in advance for your input.