First time building an AR-15, Looking to do it with fully built uppers and lowers. So far ive heard a lot about BCM and Stag Uppers. However I am open to suggestions. Im trying to keep the price as low as possible. $1,000 is really pushing it for me.. If the lower has no stock, or the upper has no rails/handgaurds Ill be going with the Magpul stock and rail systems. Plus Magpul back up sights. Thanks for any suggestions and help. Just trying to see what other options are out there.