I have a custom 300 black out. Starting with the bottom is Aero Precision lower with magpul pistol grip with magpul SL adjustable stock. Going up is a Aero precision upper receiver cerakoted in burnt brown. (Have to see in person to really see it), Aero precision R-one 15 inch m-lock rail cerakoted in burnt brown also, 16 inch barrel, JB gas tube, Aero Precision adjustable gas block, KG nickel boron bolt carrier, brace built charging handle, and Fortis muzzle break. This is a very nice AR and is fully customized. It is not cheaply made, only made with the best high end parts.  If you have any questions or are interested call or text at 785-735-seven-one-four-three. Thanks for looking.