by Meprolight
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Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight. Daytime fiber-optic illumination with Meprolight tritium at night, providing an always-on red dot with no batteries. The M21 features a 30mm diameter lens and four amber reticle options: 4.3 MOA dot, Triangle, 4.3 Bullseye, and Open X. The Fubs self-illuminated flip backup sight is low-profile and mounted to Picatinny rails with the provided 2.5mm hex key. The FUBS uses tritium illumination for day or night use and is described as being made of a strong composite material. The combination is designed for AR platforms via standard Picatinny rails.
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An analysis of AR-15 optic mounting heights, how height-over-bore affects zero offset and holdovers, and the tradeoffs between absolute co-witness, lower-third, and taller mounts.
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A high-level overview of the main optic categories, explaining tradeoffs between speed, versatility, and precision for AR-15 builds.
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