STANAG 4694, or Standardization Agreement 4694, is a critical standard in the firearms industry. It defines the specifications for accessory attachment interfaces, primarily for rifles like the AR-15 and similar platforms. STANAG 4694-compliant rails, also known as Picatinny or MIL-STD-1913 rails, provide a universal mounting system for various firearm accessories, including optics, lights, lasers, and grips. This standardization ensures compatibility, allowing shooters to easily customize their firearms. STANAG 4694 has revolutionized the firearms industry by simplifying accessory attachment, enhancing versatility, and setting industry standards for modularity and ease of customization.