whisper barrel length in AR platform

[guney]

Hello all I just put my paperwork through for SBR and supressor for a 300 whisper on an ar platform. I want to make this as compact as possible. I would love to have everyones input on barrel length. How short can I go and still manage to stabalize the bullet. I have heard comments of barrel lengths as short as 8" but would like to get some input from someone with first hand experience. Thanks in advanced.