I have a custom AR-15 heavy barrel upper I would sell for $1400 shipped. It is a tack driver, and been my go to coyote gun when I was a day hunter. Since I got night vision, and mounted it on another gun, the .223 stays in the safe. If you want the complete system, upper and lower, I would need to get fair market value for a Bushmaster lower. Gun loves 55 grain to 75 grain V and Amax.