Brownells BRN-15 5.56MM 13.7'' BBL .750'' GAS BLOCK UPPER RECEIVER 4027-3410-B3

Brownells BRN-15 5.56mm 13.7'' Barrel Upper Receiver .750 Gas Block Brownells BRN-15 5.56mm 13.7'' Barrel Upper Receiver with .750'' Gas Block The Brownells BRN-15 5.56mm 13.7'' Barrel Upper Receiver with .750'' Gas Block (4027-3410-B3) is a complete, ready-to-install upper receiver assembly designed for the BRN-15 platform. This high-quality upper features a 13.7-inch barrel chambered in 5.56 NATO paired with a .750-inch gas block, making it an excellent choice for building a compact and reliable AR-15 style rifle. Complete Upper Receiver Assembly This BRN-15 upper comes fully assembled with the barrel, gas block, gas tube, and upper receiver. It is designed to drop onto any standard AR-15 lower receiver, allowing builders to quickly complete a functional rifle without sourcing individual components. 13.7-Inch Barrel The 13.7-inch barrel is a popular choice for builders who plan to pin and weld a muzzle device, allowing the rifle to reach the legal 16-inch minimum barrel length while maintaining a compact overall profile. This length offers excellent maneuverability and is ideal for SBR-style builds and close-quarters configurations. .750'' Gas Block This upper is equipped with a .750-inch diameter gas block, a popular size that offers compatibility with many aftermarket handguards and accessories. The gas block is properly aligned and secured for reliable gas system function. Key Features of the Brownells BRN-15 Upper Complete BRN-15 upper receiver assembly 13.7-inch 5.56 NATO barrel .750'' gas block Ready to install on standard AR-15 lowers Part number: 4027-3410-B3 High-quality construction and finish Benefits for AR-15 Builders The Brownells BRN-15 13.7'' upper receiver offers a convenient and reliable solution for builders. By providing a matched barrel, gas block, and upper receiver, it eliminates the need for headspacing and gas system alignment, saving time and ensuring consistent performance right out of the box. The 13.7-inch length is especially popular for pinned and welded configurations. Recommended Applications Pinned and welded AR-15 builds Compact carbine configurations Custom rifle builds Close-quarters and home defense rifles Professional gunsmithing projects Why Choose Brownells BRN-15 Components? Brownells is a trusted name in the firearms industry for high-quality AR-15 parts. The BRN-15 series is manufactured with attention to detail and consistency, ensuring reliable performance and proper fitment. This complete upper receiver assembly delivers excellent value for builders who want quality components without the hassle of individual part selection. Technical Specifications Brand: Brownells Model: BRN-15 Caliber: 5.56 NATO Barrel Length: 13.7 inches Gas Block Diameter: .750'' Part Number: 4027-3410-B3 Build Your Compact BRN-15 Rifle The Brownells BRN-15 5.56mm 13.7'' Barrel Upper Receiver with .750'' Gas Block is a premium choice for anyone looking to build a compact and reliable AR-15. With its complete assembly and quality components, this upper provides a strong foundation for your next rifle build. Pair it with your choice of lower receiver, stock, and handguard to complete your custom BRN-15. The End