I've SBR'd another LWRC lower and looking to pick up a DI factory upper. I'd prefer something in the 11.5-12.5" range for dwell time and a little more velocity over the standard 10.5. So far, BCM, DD, and KAC are the at the forefront in my searching. Obviously, the KAC is quite a bit more, but I'm not scared to spend the loot if it's worth it. Are there "better" options? I've had a couple 14.5s from BCM and had no issues with them, but no experience with any other BCM shorties. And I know some guys that have MK18 clones with the DD 10.3 (which is super gassy when running suppressed), but anyone have experience with their 11.5"?