Sightmark Ultra Shot M-Spec FMS Reflex Sight
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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
Build history on GunPartPicker
Builders have been adding the Sightmark Ultra Shot M-Spec FMS Reflex Sight to their builds on GunPartPicker since February 2026. All time, it ranks #177 of the 482 optics builders have added. Builds with this optic are mostly chambered in 5.56 NATO (75%, then 7.62x39mm 25%), mostly on mid-length gas (75%, then carbine-length 25%), and mostly AR-15 (80%, then AR-10 20%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 5 of the 6 retailers we track have it in stock. Prices barely moved in August 2026, holding around $239.97, so there haven't been real sales lately. Buying today, the lowest price is $215.98 at Classic Firearms, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 13 builds that include this one
LMT MARS-LS PDW Complete Ambidextrous AR-15 Lower Receiver
Daniel Defense Collapsible Mil-Spec Buttstock, Brown - 21-091-04179-011
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
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 2 →Builds in the community that include the Sightmark Ultra Shot M-Spec FMS Reflex Sight
| Build | Parts | Total |
|---|---|---|
 | 24 | $1491.87 |
 | 22 | $1614.07 |
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