20 Gauge Maverick 88 Co Witness Rifle Sights + Integrated HOLOSUN 507 COMP BIG WINDOW Red MRS Reticle

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507Comp-RD handgun sight features a large 1.1” x 0.87” objective lens for enhanced shooting performance and Holosun’s new Competition Reticle System (CRS) with Holosun’s 650nm Red Super LED and up to 50k hour battery life with a 1632 cell.

CRS is an enhanced multi-reticle system with four components including a precision 2MOA dot, an 8MOA circle, 20MOA circle, and 32MOA circle with multiple combination settings to suit individual shooter preference. 507Comp-RD is made from 7075 aluminum with an industry standard footprint, and includes Shake Awake technology.


Items Dimensions (in inches)

In the Box
T10 L Key
User Manual
CR1632 Battery
Lens Cloth

Shake Awake™

Multiple Reticle System

Multilayer Reflective Glass
Shake Awake™
Shake Awake Technology is a standard feature on all current model Holosun optics and serves to extend battery life by deactivating the optic’s LED while not in use. A highly sensitive motion sensor works to detect motion keeping the LED powered on during use. This allows for duty or concealed carry with seamless operation throughout your day or shift. At the end of your day or shift when your firearm is stored, the motion sensor will detect a motionlessness state and after 10 minutes (default setting) Shake Awake Technology powers the LED off until motion is again detected. Shake Awake offers settings from 10 minutes to 12 hours depending on the model and can be deactivated altogether if preferred. The slightest touch of the optic instantly reactivates the LED so your Holosun optic is ready when needed.
More Details →

CRS: Competition Reticle System
Up to 50,000 Hours Battery Life (Setting 6)
8 Brightness Setting: 6 DL & 2 NV Compatible
Super Large Window
Convenient Tray Battery Compartment
Parallax-free & Unlimited Eye Relief
Reticle 2 MOA Dot & 8/20/32 MOA Circle
Light Wavelength 650nm
Reticle Color Red
Parallax Free Yes
Unlimited Eye Relief Yes
Magnification 1x
Multi-Coatings Yes
Power Source Battery
Battery Type CR1632
Battery Life (Hours) 50000
Brightness Setting 8 DL & 2 NV
Window Size 1.1×0.87
Dimension (in) 1.8×1.3×1.3
Weight (oz) 1.7
Housing Material 7075 T6 Aluminum
Surface Finish Anodize
Adjustment per Click 1 MOA
W&E Travel Range ±30 MOA
Storage Temperature -40℃~70℃
Working Temperature -30℃~60℃
Submersion IP67
Vibration 5000G


CoSight is a low-profile RMR-cut optics adapter for Mossberg shotguns with drilled and tapped receivers.  What makes CoSight unique is that it integrates G17-type Glock-compatible handgun sight mounts into a 1-piece adapter system to provide Back Up Iron Sight (BUIS) and co-witnessing capabilities.

Weighing only 2.5 oz, the Cosight adapter is machined from solid 304 billet stainless steel and is finished in an Armor Black Cerakote coating.  Weight reduction pockets have been machined into the underside of the adapter to achieve its light weight, while the stainless steel body provides maximum strength around the optic mounting threads and rear dovetail mount.

Utilizing the array of G17-type Glock-compatible handgun sights on the market, users can choose various sight types from plain black to white-dot to tritium night sights.  Users can also select the height of their sights for different co-witnessing schemes.  CoSight has been designed so that standard height Glock-compatible sights co-witness lower 1/4 with most optics, providing the largest clear field of view possible.  However the user can choose lower 1/3 or absolute co-witnessing by choosing an appropriate, taller (suppressor height) sight.

Co-Sight's mounting design ensures the only contacts points with your firearm are along the machined, grooved area on top of the receiver, which locks the adapter into place.  Even though it is contoured to follow the profile of the receiver, CoSight does not contact the face of the receiver and will not mar your firearm's finish like designs that contact the face when mounted.

Fits the following Mossberg drilled and tapped shotguns - 500, 505, 510, 590, 590A1, 535, 835, 930, 935, 940.

Like all our products, CoSight comes with the Defender Tactical Lifetime Warranty.