Monstrum Mossberg Shotgun Shellholder + Picatinny Rail

Good quality. Fit perfect and looks good

It installed very easy and fits perfectly. It doesn't cover the safety or go past the chamber over the barrel on a Mossberg 590 12 ga shot gun. The 6 shells are held in tightly yet I didn't have any problem removing the 6 shells and reloading. The bad reviews are not accurate. I read all the negative reviews and was concerned after I purchased the item, but I figured I would give it a shot (Pun intended). I thought if it doesn't fit I will return it but it can't hurt to try it since there are so many good reviews. It goes on so easily I was pleasantly satisfied. It took me 5 minutes to install and I didn't need longer screws or any "LOCK TIGHT" to install it and snug it down securely. All the screws and the allen wrench came in the box that I used to install it. I will say though "WHEN ORDERING MAKE SURE YOU CLICK ON THE 12 GA OR 20 GA MODEL BEFORE COMPLETING THE PURCHASE". I think that is what throws people off to get a negative review because they receive the wrong caliber shell holder (12 ga 6 shell holder or a 20 ga 7 shell holder, that also threw me off in the description compared to the picture provided they have to describe the item on the Amazon page). And they do not realize it until they receive it and some people after receiving it. I ordered the product then had to cancel because it was set on the 20 ga, It was easy to cancel that order and reorder the 12 ga model. I don't have a picture but it fit perfectly on my Mossberg 590 12ga as pictured on other good reviews.. Sturdy metal and polymer material, built to last and take some good hard working abuse !!! I AM VERY HAPPY WITH THIS ITEM , IT IS JUST WHAT I WANTED !! I will order again if I get another Mossberg 500, 590 or 590A1 12 ga.

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.

Definitely good quality, perfect fit on my mossberg 500.

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 shooting I 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.

First, the product is well made. It looks great on the gun and works well. Everything I had hoped for. Purchased it for a 930 tactical, understanding that there could be fitment issues. Was very pleased to find that these were minor and easily addressed with a razor saw and a small file. The screw holes were dead on, no need to start the screws themselves at any sort of a slight angle or wiggle them as one often finds in bolt on products for anything. Screw length did not need to be trimmed, as I have read some people have needed to do when using other products marketed for the pump versions on the semi-auto. Torx head screws are an excellent touch; thanks Monstrum! Fore end needs to be notched approximately 1/4" x 1" to allow the unit to be mounted. A very easy process, as you can use the unit itself for a pattern to scribe your cut line by temporarily attaching it with a couple of screws. After that, clean up and round the corners with a file, and it will look like it came from Mossberg that way.

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.