I built this AR15 last year from a Model 1 Sales kit. It's all flat top. 16" heavier barrel, NOT M4 profile. It has UTG's extended carbine quad rail. Don't be fooled by the UTG name, this rail is sturdy. Has a YHM flip up front site and unknown manufactorer rear flip up site. IT has had less than 500rds shot from it. In great condition, mostly stays in my safe. One 30rd mag included (not pictured) I'm looking to get $850obo for it. I'm in Lafayette, La and will ship to your FFL.