Hi everyone. I posted here a few weeks ago, asking about building a precision rifle. So far I have a Larue Stealth 18" upper and LT104 mount being shipped to me and have already gotten a Geissele SSA trigger, lower parts kit, buffer assembly and Magpul ACS and MOE grip. I did run into a problem with the lower receiver. I was looking forward to getting the matching Larue Stealth lower receiver, but I am a California native. Currently stationed in Georgia, but I have called Larue and they said that they cannot sell me the lower receiver as I am still a CA resident. I have been looking around and some reviews have said that the Larue Stealth upper does not always fit other manufacturers' billet or forged lowers. Can anyone tell me more about this or suggest other lower receivers I can purchase instead? Thanks!