
I am looking for an upper. I'm looking for a mk18 10.3, 10.5 inch barreled upper with fsb and free float quad. I'm looking for this chambered in .300 black out with lpgb pistol length gas. I'm not to concerned with any specific parts as this is a custom build. I am also open to finding a gunsmith that could build this upper and find the correct profiles and able to drill the tapered pin holes.