Brownells BRN-4 5.56MM 10.4'' HEAVY BBL COMPLETE UPPER W/9'' HANDGUARD BRN4-CU-10.4H

Brownells BRN-4 5.56mm 10.4" Heavy Barrel Complete Upper w/ 9" Handguard BRN4-CU-10.4H Brownells BRN-4 5.56MM 10.4'' Heavy Barrel Complete Upper w/ 9'' Handguard BRN4-CU-10.4H The Brownells BRN-4 Complete Upper (BRN4-CU-10.4H) is a fully assembled, ready-to-install upper receiver designed for the Brownells BRN-4 platform. This complete upper features a 10.4-inch heavy profile barrel and a 9-inch handguard, delivering maximum durability and sustained-fire performance in a compact configuration. Short-Stroke Piston Operating System The BRN-4 complete upper utilizes a reliable short-stroke piston system. This design keeps the action significantly cleaner by preventing carbon fouling from entering the receiver, resulting in improved reliability, reduced maintenance, and consistent performance even during high-volume shooting. 10.4-Inch Heavy Barrel This upper is equipped with a 10.4-inch heavy profile barrel chambered in 5.56mm. The heavy barrel profile provides superior rigidity and heat dissipation, allowing for better accuracy during sustained fire. This makes it an excellent choice for duty, training, or applications where barrel longevity under heat is critical. 9-Inch Handguard The included 9-inch handguard provides ample rail space for mounting accessories while keeping the overall length of the rifle compact. Its length is well-matched to the 10.4-inch heavy barrel, offering excellent ergonomics and accessory mounting options in a short, maneuverable package. Key Features of the Brownells BRN-4 Complete Upper Complete assembled upper receiver 10.4-inch 5.56mm heavy barrel 9-inch handguard included Short-stroke piston system Model Number: BRN4-CU-10.4H Common Applications BRN-4 and HK416-style builds Short-barreled rifle configurations Professional and duty use High-volume training and competition Users requiring maximum barrel durability Benefits for BRN-4 Owners This complete upper offers a convenient, turnkey solution for building or upgrading a BRN-4 rifle. The heavy barrel combined with the short-stroke piston system provides exceptional reliability and heat resistance, while the included handguard allows for immediate accessory mounting. Why Choose Brownells BRN Products? Brownells has developed the BRN-4 series to deliver reliable performance in the HK416 style. This complete upper reflects their commitment to producing high-quality, fully assembled components that meet the needs of serious shooters and professional users. Technical Specifications Brand: Brownells Model: BRN-4 Complete Upper Caliber: 5.56mm Barrel Length: 10.4 inches Barrel Profile: Heavy Handguard Length: 9 inches Operating System: Short-Stroke Piston Part Number: BRN4-CU-10.4H BRN-4 10.4" Heavy Barrel Complete Upper The Brownells BRN-4 Complete Upper (BRN4-CU-10.4H) is a fully assembled piston-driven upper receiver featuring a 10.4-inch 5.56mm heavy barrel and 9-inch handguard. Designed for the BRN-4 and HK416 platform, this complete upper delivers exceptional durability, reduced fouling, and sustained-fire performance. Ideal for close-quarters, duty, and high-round-count applications, this ready-to-install upper provides a robust and reliable foundation for your BRN-4 build. The End