Tri-Rail Adapter Kit for Mossberg 590 12-Gauge

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  • $40.50
  • Regular price $45.00
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If you have a flared breacher barrel model, please see this product for the correct rail.

This rail system offers three, 3-slot picatinny rails for Mossberg 590/590A1/Shockwave 12-gauge firearms.  This kit includes a rail system machined from solid 6061-T6 billet aluminum and steel swivel screw.  Both items are coated with color-matched Cerakote ceramic coating to match the firearm's factory finish and for increased durability.  Attaches over the magazine cap for an easy 30-second installation. (Optics shown not included)

*May require modification on models with choke systems. Not compatible with bayonet installed. Not compatible with Streamlight TL Racker or Magpul forend installed on 14" barrel Shockwave*

Customer Reviews

Based on 8 reviews
Top shelf

I’m glad I waited to find this product, this is top shelf. The ease of installation and the options with the three mounts, is fantastic. I mounted the Olight Balder Pro R. This is by far top a top of the line set up.

L. Deaton
Shockwave 12

Quick shipping. Easy installation along secure fit. Was able to install Crimson Trace w/ red laser and light on bottom as I intended. Very good product for the 12 gauge Shockwave.


Can't imagine a better rail mount.

Nice, efficient mount.
I can't imagine anyone makes a better designed/built product.

spinrunner2 on Ebay
Just what I was looking for.

Very nice tri rail!!! High quality part!!!

Best Value on the Internet!

This is an incredibly high quality piece at an excellent price. The machining work is clean and precise, the finish is gorgeous and an absolute match to that on my Mossberg 590 Shockwave.

Superb customer service and communication!!!

I contacted Defender Tactical before hand to confirm that this tri-rail attachment would fit on my Mossberg 590 Shockwave 20 gauge. Wes got back to me super fast with a solution. He told me he had to attach an adapter for spacing on the barrel support to accommodate the smaller diameter barrel as the tri-tail was designed for a 12 gauge barrel. I added the note to my order and just a few days later, voilá.

Truly an up and coming industry giant! I look forward to seeing what Defender Tactical has in store next.