Steiner 8503 DRS1X Defendu Reflex Sight

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  • Steiner 8503 DRS1X Defendu Reflex Sight
  • Steiner 8503 DRS1X Defendu Reflex Sight
  • Steiner 8503 DRS1X Defendu Reflex Sight
  • Steiner 8503 DRS1X Defendu Reflex Sight
  • Steiner 8503 DRS1X Defendu Reflex Sight
  • Steiner 8503 DRS1X Defendu Reflex Sight

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Steiner 8503 DRS1X Reflex Sight

The new DRS1X lives up to its namesake with rapid and lethal target engagement at close quarters.

The DRS (Defendu Reflex Sight) is so versatile and effective at close range, we’ve named it after the famed Lt. Colonel William Ewart Fairbairn whose Close Quarters Combat system was designed to rapidly disable an opponent with potentially lethal force. Perfect for tactical operations or home defense, the 1x reflex sight offers three reticles calibrated for speed and accuracy at 7, 25 and 50 yards. The ultimate CQB sight, it is built with legendary Steiner’s legendary ruggedness. Lightweight, compact and simple to use.

The C2 reticle has three options (see image in photo gallery):

  • A. Singe dot
  • B. Dot and stadia lines
  • C. Dot, stadia lines and close dot


  • Rugged magnesium body
  • Choose from 3 reticle options
  • 7 illumination levels (4 day/3 night)
  • Adjustable for windage/elevation
  • Waterproof/fogproof/shockproof
  • Powered by 2 AA batteries, but can operate on 1
  • 2000+ hours of battery time
  • 12-hour Auto shutoff
  • co-witness with iron sties or use with any multiplier


  • Magnification: 1x
  • Reticle: C2
  • Reticle Color(s) red
  • Finish black
  • Elevation Adjustment, Total Capability 50 MOA
  • Windage Adjustment 1/2 MOA
  • Length 3.88 in.
  • Weight 10.4 oz
  • Illumination Settings 7 illumination settings
  • Battery Two AA, can run on one
  • 2800 hours dot only
  • Window size is .96 x 1.26 in. (height x width).
  • The overall height is 2.57 in., and it sites 2.35 in. above the rail.

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to (California law requires this warning to be given to customers in the State of California.)

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Product ID:
Reflex Sights
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