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Sightmark
Overview
The Sightmark Ultra Shot M-Spec FMS Reflex Sight is a robust red dot optic designed for quick target acquisition and durability, crafted from 6061-T6 aluminum to withstand the rigors of field use. With its Picatinny mounting interface, this sight easily attaches to a variety of platforms, allowing for seamless integration into your build. This optic is often found on mid-length gas system rifles chambered in 5.56 NATO, making it a solid choice for versatile tactical applications.
Specifications
Available Merchants(6)
Prices checked
Price Alert
October 2026 on GunPartPicker
Sightmark Ultra Shot M-Spec FMS Reflex Sight ranked #110 of the 220 optics builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #162 of the 589 optics builders have added. Builds with this optic are mostly chambered in 5.56 NATO (83%, then .308 Win 8%), mostly on mid-length gas (70%, then carbine-length 20%), and mostly AR-15 (93%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 5 of the 6 retailers we track have it in stock. Buying today, the lowest price is $215.98 at Classic Firearms, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
LMT MARS-LS PDW Complete Ambidextrous AR-15 Lower Receiver
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
Daniel Defense Collapsible Mil-Spec Buttstock, Brown - 21-091-04179-011
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Aero Precision AR-15 5.56 BCG W/C158 Bolt - Aero Logo - Phosphate
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Sightmark Ultra Shot M-Spec FMS Reflex Sight
| Build | Parts | Total |
|---|---|---|
 | 24 | $1529.84 |
 | 22 | $1671.78 |
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