Was building a nice 13.9 setup from a SOLGW barrel and Aero adjustable block I bought off GAFS years ago. Once I finally bought a Polonium K though I ended up going with Rearden stuff so now I have a cool 13.9 upper that doesn't really make sense anymore for me. I have 2 other FCD 6315 stoner style FH's. One from another GAFS purchase that I haven't used but the original owner did hence the interesting weathering and the other I mounted and used a little until I swapped over when I got my can.