These Gideon optics are currently make a huge splash in the red dot market.  Available in green or red reticle options.
 
From Gideon:
 
The large lens on the Omega red dot sight gives you a big sight picture without blocking out your field of view–always dangerous in a duty or defensive tactical situation. This makes it the perfect pistol optic choice for shooting competitions, range work, as a duty weapon, or as a backup reflex sight on larger firearms.
 
The 7075-T6 aluminum housing is made from the same material often used in components for the m-16 rifle and other firearms. This aluminum alloy is known for its durability in the field under harsh conditions.
 
The massive 22.3mm tall by 27mm wide lens is parallax free to 33 yards and features Circle-Dot and Dot ONLY options.
 
Reticle Options:
RED 45MOA Circle with a 3MOA Dot
GREEN 45MOA Circle with a 3MOA Dot
RED 3MOA Dot
GREEN 3MOA Dot
 
Elevation and windage are adjustable for a total of 90 MOA (45 MOA each) at 1 MOA per click.
 
Designed to fit the popular Trijicon RMR optic pattern common on many handguns. A low-profile 1913 Picatinny mount is also included for mounting on compatible rifles, carbines, PCC weapons, or as a 45-degree offset backup reflex sight.
 
This sight offers unlimited eye relief for quick and accurate targeting.
 
Choose from 10 brightness settings, including 8 for normal light and two night vision compatible settings.
 
A battery-extending low-power mode turns off your emitter after 225 seconds without motion.
 
Any movement, from drawing to a quick wrist shake, reactivates your reticle in milliseconds. After 12 hours Omega enters a Deep Sleep mode to conserve battery, a single button press reactivates standard motion activation.
 
The Omega red dot sight is powered by a single CR-1632 3V lithium-ion battery that’s easily replaceable without removing or re-zeroing the sight, thanks to a convenient top-loading battery tray. Expect a single battery to give you up to 50,000 hours of service life thanks to our energy-efficient features and design.
 
Weighs approximately 1.8 oz. and measures 52.5mm x 30.7mm x 31.7mm (LxWxH).
 
We made this sight shockproof and IPX7 waterproof, so it’s ready for whatever you throw at it.
 
Gideon Optics’ sights are backed by a lifetime warranty that replaces your sight if it stops working for any reason short of intentional damage.
 
What’s in the Box:
 
1913 picatinny rail mount and screws
T10 tool
Adjustment tool
Lens cleaning cloth
One pair each of the following mounting screws (recommended torque for slide mounting is 12 inch-pounds) :
6-32 x 0.374″
4-40 x 0.25″
M3.5 x 0.6 x 11mm