Bushmaster offers a diverse selection of upper receivers, catering to various shooting preferences and requirements. These upper receivers are designed for compatibility with standard AR-15 lower receivers, providing users with reliable and customizable options for their firearms. Bravo Zulu Upper Assemblies come in 16" and 11.5" barrel lengths, chambered in 5.56 NATO/.223 Remington. They feature a free-float M-LOK handguard and a salt bath nitride finish for enhanced durability. The 16" model offers a balanced option for general use, while the 11.5" version provides a more compact solution for close-quarters scenarios. QRC II LTW Upper Assembly 16" is chambered in 5.56 NATO/.223 Remington and includes a lightweight profile barrel with a carbine-length gas system. It's designed for quick response situations, offering maneuverability without compromising performance. M4 Patrolman's Upper Assembly is available in configurations with either a flat top or carry handle. These 16" uppers are chambered in 5.56 NATO/.223 Remington. They feature a carbine-length gas system and are designed to meet military specifications, ensuring reliability and performance. A4 Complete Upper Receiver provides a versatile platform for various builds, featuring a flat top design that allows for easy mounting of optics and accessories. It's suitable for users looking to customize their AR-15 to specific preferences. Each Bushmaster upper receiver is proudly made in the USA, ensuring high-quality craftsmanship and performance. Whether you're building a new rifle or upgrading an existing one, Bushmaster's selection of upper receivers offers reliable and customizable solutions to meet your needs.