The MCR Belt-Fed Upper Receiver Assembly features a 16.25-inch barrel and integrated 1913 Picatinny rail system for versatile tactical applications.MCR Belt-Fed Upper Receiver Assembly (SKU: MCR-060)16.25-inch barrel length for optimal accuracy1913 Picatinny rail compatibility for optics and accessoriesBelt-fed mechanism for sustained fire capabilityPrecision-manufactured upper receiver assemblyDesigned for tactical and professional applications requiring reliable belt-fed operation with modular accessory mounting capabilities through the standard 1913 rail interface.