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I wasn’t aware that they needed improving. The 500 model has been around for years, and has been in use by police departments for decades. The 590 model was designed in response to a request for an upgraded shotgun for the military. The Shockwave is just a shorty 590, so it ought to be at least as rugged as the full sized gun.

I have a 590A1, and I really like it. It has thicker barrel walls than either the 870, or even a Mossberg 500. The A1 version comes with rifle type sights, and most of the A1 models have a 20” barrel with an 8 round magazine tube. So total onboard the weapon is 9 rounds, not counting whatever shell holders you screw to the receiver or wrap around the stock. I don’t know that I would call this a “complaint”, but my only desire would be for the stroke of the pump action to be a little lighter and smoother right out of the box, but it also kind of broke in after not too many rounds.

There are Youtube videos of people using this model to hit with slugs at crazy distances for a shotgun.

At 100 yards:
https://youtu.be/FQearB6S6AU

Save guy at 200 yards:
https://youtu.be/ksDWEB3MaYs

Anyway, I’ve never owned an 870, but I am way more than satisfied with the 590A1, and will probably pick up a Shockwave in the next few months.

This is the model I bought: http://www.mossberg.com/product/590a1-9-shot-51668/.

Here’s what I did to it:

Enhanced safety switch:


XS Sight Systems rear peep sight and rail:


XS Sight Systems “Big Dot” front tritium sight:




I have since added a sling, and the AndyC design package (shown here):


The next upgrade will be a Magpul buttstock and forend kit with a tactical light mounted.