Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns

Monstrum is the finishing touch! Bird head grip, factory head shield, and now the Monstrum rail and side saddle. NICE! Good price with the $5 discount code and easy installation. This will last for years. I’m a very satisfied customer!

The item looks awesome just make sure the you order the size that you need mine fits perfectly and looks nice

Make sure your "firearm" is drilled and tapped for fit and you select the correct gauge. It however mounted perfect. Took a dremel and cut off the first and last shell holder (taking it from 7 shells to 5) so neither hand would get scrapped which was a issue. Holds shells well (tight but not to tight) Would buy again

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.

Perfect fit and accessory for 20 ga Shockwave.

Good Quality, Good Value. Pros; Easy to mount, (4) #8-40 TPI Screws. Cons; Screws should be 7/16ths under the head rather than the 3/8ths supplied. Careful where your drill goes through, careful not to drill too far forward. You don't want to drill into the barrel area... there is a front and a back to the picatinny rail.

Well made, strong. Moss. 500 20 ga. Fit perfectly

Just bought this for a mossberg 500 20guage. When you mount the shell holder you do not have enough room to rack the slide and put a shell into the chamber. Very bad design. I’m keeping it because the piccatiny rail mount fits and I need a rail to mount my optic on for a hunting trip and don’t have time to send this one back and wait on another. I just spent $30.00 extra for a picatinny rail mount because the shell holder is useless.