There are tons of Red Dot Sights & Accessories on the market, but if you're looking for a holographic sight, you should consider the Vortex Razor AMG Red Dot Sights Designed by Vortex Optics, these holo sights have 15 total brightness settings, including 4 night vision settings, to give you tons of options no matter your shooting conditions. Attaching easily to Picatinny rails, these Vortex Razor AMG Red Dot Sights are durable, rugged, and parallax-free, giving you clear aiming capabilities while being able to withstand the rigors of being out in the field. They even have non-critical eye relief so you can acquire your targets and take aim as fast as possible. 
What Is the Difference Between AMG UH1 Gen 1 and Gen 2?
The primary difference in these generations of the Vortex Razor AMG Red Dot Sights is that the Gen 2 has a much larger rear window. This means you have a wider field of view and more space from which to aim from, since a holographic sight doesn't require you to be perfectly lined up in the middle to use the reticle. Additionally, the Gen 2 weighs less than the Gen 1 despite being longer, which helps increase the maneuverability of your firearm.
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