The Reptilia RMU (Rail Mount Ultimate) 12-Slot Mount is a long-format, professional-grade Picatinny riser designed to elevate optics and target-designation accessories by 0.625 inches. This specific 12-slot version provides maximum rail real estate, making it ideal for running large holographic sights in tandem with magnifiers, or for mounting thermal and night vision clip-on devices while maintaining a consistent height. Machined from aerospace-grade billet 7075-T6 aluminum and finished in a durable MIL-STD Type III hardcoat anodizing, it utilizes Reptilia's spring-loaded nitrided steel clamp system for a secure, low-profile attachment to any M1913 Picatinny rail. The height is specifically chosen to bring lower-third co-witness optics up to an ergonomic 2.26-inch centerline, facilitating a more upright shooting posture and better compatibility with head-borne night vision systems. Reptilia .625" Height 12 Slot FDE RMU Mount 100-388