Global Ordnance 15 Upper 5.56 12.5" 1/7 Twist Monolith Barrel KeyMo Brake

The GO15 12.5" Upper Receiver is built for performance and reliability. Featuring a 12.5" Monolith barrel with a 1:7 twist, machined from a single piece of 41V50 ordnance-grade steel, it integrates the gas block and muzzle device for a suppressor-ready, zero-leak setup. Designed as a ready-to-go suppressor host out of the box, it’s built to enhance recoil control, reduce blowback, and maximize reliability. A full-length 1913 Picatinny rail bridges the upper and handguard, providing a rigid, uninterrupted mounting surface for optics, lasers, and accessories. The Monolith barrel is machined from a single piece of 41V50 ordnance-grade steel and features an integrated gas block for zero-leak operation. A thermal-fit oversized extension and interlocking receiver tab improve accuracy and reduce handguard deflection. The bolt head is reinforced with a large diameter and generous corner radius to reduce stress and enhance strength. All-steel feed ramps are fully integrated for reliable feeding. Compatible with Dead Air KeyMo HUB-mount suppressors. These complete uppers are designed for standard AR-15 platforms and compatible lowers.

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