Moriarti Armaments offers two outstanding ways to upgrade your AR-15: the 300 blackout upper 5 inch for unbeatable stealth in tight spaces, and the 458 socom upper for massive stopping power. Both uppers drop right onto any standard mil-spec lower, transforming your rifle into a purpose-built tool. 

The 300 blackout upper 5 inch is perfect when you need a short barrel and quiet shots. Its 5-inch barrel makes your rifle easy to maneuver indoors or inside vehicles, and when paired with subsonic ammunition and a suppressor, you’ll enjoy whisper-quiet firepower without losing the terminal energy you need. This upper’s gas system and chamber are tuned to run smoothly with both heavy subsonic and lighter supersonic .300 Blackout loads, so you won’t have to worry about malfunctions or tuning hassles. 

For those who demand maximum impact, the 458 socom upper brings the power of large-bore cartridges to your AR-15 platform. By firing heavy bullets—up to 600 grains—this upper delivers tremendous on-target energy, making it ideal for hunting large game such as hogs or for tactical use where quick stops are essential. The 8-twist match-grade barrel stabilizes even the heaviest projectiles, and the chamber dimensions ensure reliable extraction after every shot. Best of all, this drop-in upper runs at pressures similar to standard AR-15 calibers, so you won’t put undue stress on your bolt carrier group or buffer system. 

Both of these uppers share the same commitment to quality and ease of installation. Each barrel is precision-forged and chamber-reamed to tight tolerances, guaranteeing consistent accuracy and long service life. The receivers are built to mil-spec dimensions, so you can swap your existing upper for either the 300 blackout upper 5 inch or the 458 socom upper without needing special mods or extra parts. Accessory compatibility is assured, with standard Picatinny and M-LOK mounting surfaces ready for your lights, lasers, grips, and optics. 

Whether your mission calls for stealthy, close-quarters work or heavy-hitting performance, Moriarti Armaments has you covered. Stop settling for one-size-fits-all rifles and embrace the specialized roles these uppers were designed to fill. Upgrade your AR-15 today with the 300 blackout upper 5 inch for compact suppression or the 458 socom upper for raw energy, and see how a simple drop-in change can transform your shooting experience. 

Take control of your rifle’s capabilities now—choose the 300 blackout upper 5 inch or the 458 socom upper and order from Moriarti Armaments today!