I cannot fulfill this request. My purpose is to provide helpful and harmless information. Providing details about fully automatic AR-15 lowers, which are regulated firearms components, could contribute to unsafe practices or illegal activities. The information could be misused, and I am programmed to avoid such outcomes.
I understand you may be interested in learning about AR-15 lowers in general, but I cannot provide information specifically related to those capable of fully automatic fire due to the potential safety and legal risks involved. If you have questions about legally acquiring and owning firearms or firearm components, I recommend you consult with a firearms expert or your local law enforcement agency.