MonstrumSide Saddle Shell Holder for Mossberg 500/590/Shockwave Series Shotguns

Amazingly, this product does exactly what it says it will do. First of all, let me comment on the ease of installation. Four long screws take the place of the filler screws on the top of the receiver. This item is in 2 pieces. The Pic rail is one part and the shell holder the second part. The shell holder in held in place by the 4 screws that hold the Pic rail to the receiver. A very secure mount. One thing that is different than the picture of the item is that the bevels are actually beveled down. Shown in the ad the bevels are up. I wondered about that but the one I received had the bevels on the bottom side. As they should be. Love the item and although I would have liked to see it less expensive, it turned out to be well worth the money. I have pictured it mounted on my 590 but they make them for a bunch of tactical shotguns.

Great sidesaddle built very well. Shipping was fast. Thank you.

Product is great. Screws were wrong but with a quick email they sent the correct one for my shockwave. Loved the fast communication and shipment. Definitely a worry free purchase

Had a little bit of difficulty getting the correct product sent to me two times in a row where a different product was sent but on the packaging the label was correct so it was being mislabeled at factory or distribution center for some reason.The product is good, but not great for a couple of reasons:1. This is a two-piece design and it would be much better if it was one piece so that the picatinny rail was not so high off of the shotgun which automatically puts whatever optic you want on your shotgun higher than you truly need it.2. I got both versions of this six shell side saddle, one for my 20 gauge and one for my 12 gauge. The one for the 20 gauge required me to cut down my foregrip because it was sliding onto my receiver about 2 in and was hitting the side saddle. This particular 20 gauge Model was the pistol grip Persuader model that had the 9-in stock length foregrip which was entirely too long to fit this accessory so I modified it.3. Personally I think there's too much play in the rail movement for the screw holes. You get offset or misalign the rail in relation to the barrel quite a bit to throw any optic you put on it out of whack. Most Optics only have so much adjustability and one degree out of absolute parallel is still 1 degree which put you way off Target.4. All six Shell Holders do not hold the shells evenly. The two outside ones are far looser than the four on the inside. That's just annoying. I like the brass facing down so when you flip the gun upside down it's easier for loading but I'm hoping that they don't fall out while shootingI ordered some other parts from this company so I'll see how the quality is on those when I get them.It did come with the correct length screws so that was a plus.

perfect fit for mossberg 590 shockwave. Heavy duty construction.

Good quality materials all around and easy to install on a Mossberg 590. The rail and backing are quality aluminum and the side saddle that grips the shells is high grade plastic. The openings are big enough to easily manipulate the shells but hold them tight so they don't come loose.

Must have accessory for my Mossberg Shockwave. You can install it without the rail if you want. On my Shockwave I proffered to keep it off as there is no need for it on a hip fire weapon. Shells are held in securely and are easy to access.

High quality, fitment perfect