C
Cneber4199010/10
Reviewed on March 16, 2026Verified with Build
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Vortex Defender-ST Micro 6 MOA Red Dot Sight, Black - DFST-MRD6
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Vortex Optics
Overview
The Vortex Defender-ST Micro 6 MOA Red Dot Sight is a compact optic designed for quick target acquisition and versatility in various shooting scenarios. With a 6 MOA dot size, it provides a clear aiming point that is easy to track, while the Picatinny mounting interface ensures compatibility with a wide range of firearms. This red dot sight is commonly found on builds featuring a carbine gas system chambered in 5.56 NATO, making it a reliable choice for tactical and competitive applications.
Specifications
MPNDFST-MRD6
Reticle ColorRed
Mounting InterfacePicatinny
Dot Size6 MOA
ColorBlack
Optic TypeRed Dot
Vortex Defender-ST Micro 6 MOA Red Dot Sight, Black - DFST-MRD6
August 2026 on GunPartPicker
Vortex Defender-ST Micro 6 MOA Red Dot Sight, Black - DFST-MRD6 was the sixth most added optic on GunPartPicker in August 2026, behind the SIG Sauer Romeo 5 Gen II Red Dot, Black - SOR5101, with about 4% of all optics added to builds. Up from #7 in July. Builds with this optic are mostly chambered in 5.56 NATO (76%, then .223 Wylde 12%), mostly on mid-length gas (67%, then carbine-length 17%), and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today all 9 retailers we track have it in stock. Prices barely moved in August 2026, holding around $263.99, so there haven't been real sales lately. Buying today, the lowest price is $254.99 at Sportsmans Outdoor Superstore, 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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Read the guide: AR-15 Red Dot & Optic Guide →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the 191 builds that include this one
Smith & Wesson M&P15 Complete Lower 5.56x45mm/.223 Remington, Black - 812002
Lower Receiver$339in 29 builds
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Trigger$335in 25 builds
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
Stock & Brace$34in 23 builds
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
Upper Receiver$881in 11 builds
SilencerCo Velos LBP 556 Rifle Suppressor, Black
Suppressor$870in 25 builds
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Charging Handle$85 · out of stockin 17 builds
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.
100%
AR-15100%
CaliberBased on real build data showing which calibers builders choose alongside this product.
76%
5.56 NATO76%
.223 Wylde12%
.308 Win8%
300 Blackout4%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
66.7%
Mid-Length66.7%
Carbine16.7%
Rifle16.7%
Builds Featuring This Part
See all 10 →Builds in the community that include the Vortex Defender-ST Micro 6 MOA Red Dot Sight, Black - DFST-MRD6
| Build | Parts | Total |
|---|---|---|
 | 22 | $1752.67 |
 | 25 | $5724.36 |
 | 25 | $1235.84 |
 | 22 | $1458.58 |
 | 30 | $2943.97 |
 | 10 | $775.73 |
 | 10 | $1111.90 |
 | 22 | $4791.54 |
 | 10 | $1280.74 |
 | 26 | $2483.45 |
Customer reviews
5.0out of 5
1 global rating
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