I've done it multiple times. SA did it for a pistol build of mine and didn't re-heat treat. So no. The only problem is if you do it, you cannot use their carrier anymore and must use another like Adam's Arms.
I've done this for a 7.62x39 10" EWS bufferless build with Adams Arms strike key, a 308 16" Rogue mod with their Revolution carrier, a 5.56 14.5" EWS bufferless build with an Adam's Arms strike key, and a 14.5" 5.56 build with a lightweight Adam's arms carrier.