The best pistol red dot sight is the Shield RMS2 with the Glass Lens.

The RMS2 from Sheild Sights is a red dot that is ready to perform. The new RMS2 improves on all of the features that made the Shield RMS the best pistol red dot sight in a lightweight yet ruggedized construction. The body of this optic is made with an aerospace grade aluminum, making it an improvement over any polymer body red dot. The LED remains crisp thanks to the inclusion of a glass lens and the low Parallax anti reflective coating provides a nice clear image no matter the lighting conditions. The fast automatic brightness has got you covered in any and every lighting condition with the perfect setting. If you want a red dot that is ready to mount to your favorite defense or duty pistol then look no further than the RMS2.

Sheild Sights RMS2 Red Dot Sight Specifications and Features:

• Eye-Safe LED sight
• Magnification 1X
• Reticle: 4 MOA Red Dot
• Glass Lens
• Low Parallax Coating
• Truhold Zero System
• Fast Automatic Brightness Adjustment
• Compatible with Night Vision
• Aerospace Aluminum Construction
• Weight 0.61 oz
• 1.7 x 1.0 x 0.9 inches
• Runs on 1X CR2032 Battery
• Battery Life 1 to 3 years
• Assembled in the UK
• Black

Fits:

• Optic Plates or Pistols with a Shield Sights RMs footprint mounting