Not too long ago Core 15 Rifle Systems added three new 300 Blackout complete uppers to their lineup, one 9.5″ Pistol Upper and two 16″ Uppers. Many of you were asking if you could buy the barrels separately but at that time you couldn’t. Obviously they listen to their customers because they just released their new 300 Blackout Barrels for individual purchase. I’ve actually been thinking about piecing together a 300 Blackout upper with some spare parts. Maybe I’ll use one of these really nice looking barrels. Check out the details below.