Nope, it'll be 5.56.
It's really not going to be anything special. My current 10.5" pistol was put together with the intention of converting it to SBR once I get around to stopping by the Sheriff's office for a signature and submitting all the paperwork and the $$$ to the ATF. Still planning to do that, but I discovered I really like the pistol configuration. The 10.5 is really just a short carbine, so this time I'm starting with a 7.5" barrel and a true pistol gas system. I'll top off the barrel with a Noveske KX3 to help build up the gas pressure and run it all under a 9" quad rail. Parts should begin to arrive early next week and I'm hoping to have it finished and range ready by next weekend...