User Ratings
No ratings yet
Be the first to review this product
- Steiner DRS 1x Defendu Reflex Sight is a compact red dot sight designed for close-range engagements
- Reticle: C2 with 3 reticle options (single dot, dot with stadia, dot with stadia and close dot)
- Illumination: Red with 7 brightness levels (4 Day / 3 Night)
- Magnification: 1x
- Battery Type: AA (2 included), can operate on 1
- Battery Life: 2000+ hours
- Auto Shutoff: 13 hours
- Construction: Magnesium housing, waterproof, fogproof, and shockproof
- Mount Type: Picatinny
- Gun Models: AR-15, AR-10, AK-74, AKM, AR-47 (AK-47 variant listed as compatible in specs)
- Dimensions: Length 3.88 in, Width 1.92 in, Height 2.57 in
- Weight: 10.4 oz
- Included Accessories: Batteries
- Made in USA
- Model/Variant: Demo available with variant code ST-RD-DRS1-8503-DEMO
Specifications
- Manufacturer:
- Steiner
- Category:
- red-dot-holo-sight
- Weight:
- 10.4 oz
- Length:
- 3.9"
- MPN:
- 8503DEMO
- Required Component:
- No
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$474.99
Lowest
$474.99
Highest
$474.99
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertBundle Package
This is a bundled product that includes multiple components. The exact contents may vary - check the product description for more details.
• Complete assembly ready to use
• Multiple components included
• Value package pricing
Similar Products

Vortex Optics StrikeFire II Red Dot Sight 30mm Tube 1x 4 MOA Red and Green Dot with Lower 1/3 Co-Witness Cantilever Picatinny Ring Mount Matte Black
Vortex Optics
$149.99

SIG Sauer Romeo4T Pro Red Dot 1x .5 MOA, Black - SOR44101
Sig Sauer
$549.99

Sig Sauer Romeo MSR Red Dot Gen II Optic - SORMSR101
Sig Sauer
$109.99

Vortex Triumph 2 MOA Red Dot Sight w/ Lower 1/3 Co-Witness Mount, Low Mount, Unlimited Eye Relief, Waterproof, Night Vision Compatible
Vortex
$99.00

Trijicon RMR Type 2 3.25 MOA Red Dot Sight Cerakote Olive Drab Green RM01-C-700623
Trijicon
$455.99

Vortex Crossfire 2 MOA Green Dot Black Sight CF-GD2
Vortex
$149.00

Sig Sauer Romeo5 Gen II Compact Red Dot Sight 1x20mm 2 MOA SOR5102
Sig Sauer
$106.99

Aimpoint Patrol Rifle Optic PRO Red Dot Sight LRP Spacer 39mm
Aimpoint
$497.00
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
AK Optics Mounting Guide: Side Rail vs Dust Cover vs Handguard
Compare the main AK optics mounting approaches and choose the right setup for durability, repeatable zero, and practical shooting performance.
8 min read
Guide
Glock-Compatible Platform Overview: What Matters for Reliable Builds
A practical overview of Glock-compatible pistol builds, including compatibility checkpoints, reliability priorities, and upgrade sequencing.
7 min read
Guide
Glock-Compatible Red Dot Setup and Zeroing Basics
How to set up a red dot on Glock-compatible pistols, avoid mounting mistakes, and choose a practical zero for defensive and range use.
7 min read