I have a nice custom ar9 build that has a lot of nice upgrades on it. It comes with an super safty trigger an guisselie charging handle  maxim difence roller delay buffer an 8" ballistic advantage barrel a 6 position adjustable stabilizing brace. I used a regular ar15 upper and lower on this build using endomags to feed the gun they are 5.56mm magpul mags converted to a 30rnd 9mm mag it comes with 6 of them the mag is required to eject and unload the firearm thanks for looking