While they may exist, I haven't seen any other long stroke piston 300BLK uppers with adjustable gas blocks, so there is that.

I only care about the placement because it is an adjustable gas system. Now if they can make a longer rail that still allows for easy adjustment of the gas block, that would work too.

True but given the choice, I'd prefer to be in the 8.5 to 9" range. Not just because of the suppressor but also velocity. 8" is what I considered minimum. Not a deal breaker, just a preference.

Out of all that it’s the scorpion mag 9mm lower that I want.
I sold my scorpion but kept a dozen mags just in case