I have a 20" AR rifle setup for long range or hunting. 
The lower is a billet MOA armorers (local company) with a timney 3lb trigger. Magpul PRS lite stock setup, Seekins ambi controls, anti walk/rotate pins, and Magpul grip. 
Upper is a VLTOR MUR1 with a White Oak Armement 20" HBAR, .223/1x7, rifle gas barrel.  It's threaded 1/2-28 with an adjustable gas block. 16" BCM KMR with arca rail/pic mount for bipod. It has a nickel boron BCG, and a ambi strike industries charging handle.  I primarily used this with a suppressor, has been very accurate for me well past 600 yards.  Went to a bolt gun, now this just sits.  Scope not included but I can throw in an Arken 20moa/30mm mount with it. 
thanks for looking. Sling not included.