that looks great, but you know what stock would look good on it is the Tailhook Brace… i’ve got one on my MP40 and i love it… great feel and actually really functional as a brace as well as when you put it to your shoulder if you ever do… not saying i do… but you get the picture.
Looks like I was wrong assuming it would be approximately the same length for reasons of keeping manufacturing simpler. The pictures clearly show a shorter handguard with one less MLOK slot and fewer cooling holes on top. MLOK slots end to end are around 1.5" that would point to the ~8.5" barrel being correct.