Thanks for the additional good input everyone! I've decided to keep the .308. It is a very useful tool, even if not used frequently. To scratch the 12.5" SBR itch, I'm selling a high-end Leupold target scope off a .22 that also doesn't see as much use as I thought it would. That gives me $650 to start building my upper. I can use it right away on my MK18 lower while I wait for the stamp to go through on my Noveske lower. I already have some parts, just need a barrel, rail, and BCG.
Now I'm just debating on SS vs CHF on the barrel, DD vs Noveske (or BCM 410). The issue is balancing accuracy against hard use. Since this would serve as a backup to my MK18, I don't want to burn out a $350 SS barrel too quick, especially since suppressors are involved as well. At the same time, I would want at least MOA accuracy with match ammo. A previous 16" DD lightweight barrel would do about 1.5 MOA.
Thanks for input on the barrel, looking forward to getting this built!
ETA: reason for sticking with 12.5" barrel is an SPR-M4 suppressor.
Last edited by ASH556; 02-27-14 at 13:30.
Semper Paratus Certified AR15 Armorer
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