This should be a short one. I, along with many others, would like to know where all of these AR-15 builders, get their parts supplied from. By having this knowledge AR-15 buyers will have a better idea of the quality of these weapons based on FACTUAL INFORMATION, and not simply hear say and opinion. So to try to keep this on track I'll provide the following questions in hope that someone can accurately answer them with actual information. If you know, feel free to inform us. If you don't know, please refrain from posting opinion. 1.) Where does Bushmaster purchase their parts from? 2.) Where does Colt purchase their parts from? 3.) Where does Daniel Defense purchase their parts from? 4.) Where does Stag Arms purchase their parts from? 5.) What parts, if any, do these manufacturers, (Colt, D.D., Bushmaster, Stag,) manufacturer on site in their own plant? 6.) What, if any, is the difference in the quality level of these parts that are supplied to them? I've only listed some of the more popular brands that have been discussed in past threads. With that said if anyone has any information on other AR-15 manufacturers as to where they get their parts from, or who they are manufactured by, please let us all know. Again we are only interested in fact. For example if you say, "Colt buys their bolts from CMT". Please provide how you obtained this information. Don't post hear say, only what you have direct knowledge of to be actual fact.