Nice! So, why the 12.5" bbl? I know Grendel usually likes longer bbls, but will it not function in something shorter or did you pick the length part b/c of the Type 2 gas block?
Also, I notice your rear sight is on backwards and I am thinking you do that to get the rear aperture the right distance from your eye without it folding down off the back of the receiver? Is that right?
Looks really nice.