I'd think the Howa mini 6.5 Grendel would be a good fit for you.

I always wanted to build a 6br at 18" with a DBM but went .223AI at 21" instead as it just kinda fell in my lap.

Screw you! I'm voting for Trump again!

Ecc 10:2
The heart of the wise inclines to the right, but that of a fool to the 24HCF.