Keeping in my mind that I'm still relatively new to the AR world I have a question I was hoping to get some feedback on. How can some private builders put together very high quality rifles then turn around sell those rifles for much cheaper than it would realitsticaly cost myself to build them? I know its always cheaper to buy an upper and lower seperatley....I get that, but my personal example being the rifle I just purchased. The builder told me every little thing he put on/in it and when I calculated everything up on my own by doing an internet search of each componet (I did try to bargain shop a little but in no way to the extent I would if I was actually buying the parts) and they came in at over $1500 but yet I only paid $1360 for the rifle, everything on it is brand new. So I'm wondering if some builders are able to get parts at cost from manufactures or if there is some other way that in the future I could put together the same quality rifle my builder did at his cost. My apologies if the question is unclear or just an irritating noob question but its been bouncing around in my mind for a day and a half.