Here at Veriforce Tactical we pride our selves on Building and producing only quality AR 15 300 Blackout Upper Receivers. We use barrel blanks that are above industry standards and produce our own Billet stainless steel 300 blackout AR barrels to use with our uppers. We try to build unique and custom 300 blackout pistol uppers that not everyone has. Quality is a big deal for us. No one wants to have problems with they take a trip out to shoot. Thats why we warranty all of our AR 15 300 blackout pistol uppers for one year for personal use. AR 15 300 AAC Blackout pistol uppers are our specialty as well, using nitrided barrels with our custom muzzle devices. All of our barrels are tested with 147 grain plinking ammo, 128 grain high pressure, and Subsonic Ammo. Check out all of our AR 15 .300 blackout complete upper receivers for sale.