CoSight Optic Adapter w/ Integrated Backup Sight Mounts

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  • $75.00
  • Regular price $129.00
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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. 

UNLESS SPECIFICALLY STATED OTHERWISE, OPTICS AND BACKUP SIGHTS SHOWN ARE NOT INCLUDED.


Customer Reviews

Based on 9 reviews
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D
Dan R
Perfect Complement For A Reflex Red Dot Sight

A red dot sight is a perfect complement to your defensive shotgun, and this adapter is a perfect complement to your red dot sight.

The reflex red dot sight allows you to keep your eyes open and field of vision wide while providing instinctive aiming of your defensive shotgun. But it is an electronic device, and not entirely immune to failure at the worst possible time.

This adapter takes that concern off the table. If your reflex sight fails, you have a perfect Glock-style iron sight right there without even shifting your sighting angle. Even without a red dot, I consider the sights on this adapter to be a step up from the bead sitting out there at the muzzle. I purchased the sights from Defender Tactical for convenience, but I think I will probably upgrade to Trijicons soon.

This setup in combination with an M-Lok-mounted, thumb-operated flashlight makes for a lean and lightweight configuration.

The machining, fit, and finish are impeccable. I couldn't be happier!

M
Michael Haynes
Red dot for shotgun

This fit real good on my mossberg

R
Rich

Works great and very well made. Simple install on a Mossberg 590.

T
Tractorguy

Great accessory! Well designed and perfect machining. A+++++++++

J
J H
Perfect Fit

This RMR optic adapter with integrated Glock sites is machined to perch perfectly onto a Mossberg 500 series or Maverick 88 receiver. It fits so well, I used it as a jig to drill and tap a Maverick 88 with great results. It’s basically impossible to sit it on the receiver askew. I mean it just fits straight. The screws are the standard 8-40 UN thread.