Looking For a Contender Pistol 1:8 300/221 Barrel

[Scalce]

I am building a suppressed SBRed 300/221 AR but as I wait I would like to get a barrel for my contender and maybe keep it in a pistol configuration for now.

Maybe down the road I will SBR the Contender but I am just looking to play around with loads.

I was thinking maybe something 10.5" in a 1:8 twist but it seems that the ones Thompson made have way too slow a twist and the custom ones from SSK have true 300 Whisper chambers and I am going to be using 223 parent cases.

Any options?