Maverick 88 Co Witness Rifle Sights + Integrated HOLOSUN 407C Solar!

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The HS407C X2 is an open reflex optical sight designed for full-sized pistol applications. The HS407C X2 improves on previous versions by adding Lock Mode which was first introduced in our 2018 LEM pistol optic models. Lock Mode, when activated, locks the buttons preventing inadvertent setting changes.

Additional features include Holosun’s Red Super LED with up to 50k hour battery life, Solar Failsafe, precision 2MOA dot, and Shake Awake. The durable housing is made from 7075 Aluminum, uses an industry standard footprint, and houses the 1632 battery in a side-mounted tray for easy replacement when needed.


Items Dimensions (in inches)

In the Box

  • T10 L Key
  • CR1632 Battery
  • User Manual
  • Lens Cloth


  • Solar Failsafe™
  • Shake Awake™
  • Super LED
  • Multilayer Reflective Glass

Solar Failsafe™

Solar Failsafe Technology is one of many innovations featured on solar-equipped Holosun optics. With Solar Failsafe, if your battery fails you always have a backup power source when natural or artificial light is available. Solar Failsafe is activated while in Auto Mode where reticle intensity is automatically adjusted based on the amount of light the solar cell receives. In brighter conditions you have a brighter reticle and in lower-light conditions the reticle will step down in intensity to match any lighting conditions. On models equipped with a super capacitor, it is possible to run the optic, indefinitely, in daytime and night conditions, by maintaining a charge through the Solar Failsafe System all without a battery.

More Details →


  • 2 MOA Dot Reticle
  • Up to 50,000 Hours Battery Life (Setting 6)
  • 12 Brightness Setting: 10 DL & 2 NV Compatible
  • Convenient Tray Battery Compartment
  • Parallax-free & Unlimited Eye Relief


Reticle 2 MOA Dot
Light Wavelength 650nm
Reticle Color Red
Parallax Free Yes
Unlimited Eye Relief Yes
Magnification 1x
Multi-Coatings Yes


Power Source Solar & Battery
Battery Type CR1632
Battery Life (Hours) 50000
Brightness Setting 10 DL&2 NV


Window Size 0.63x0.91
Dimension (in) 1.78x1.15x1.15
Weight (oz) 1.5



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.