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!

This product is fantastic! The material is incredibly strong, yet the gun still feels surprisingly light. Installing the slide was a breeze; it fit my 535 perfectly. To top it off, the appearance it gives my gun is incredibly sharp.

For a home defense shotgun this is a must-have accessory. It enables you to carry extra ammo while also providing a mounting platform for powered optics, such as a red dot. Most shotguns have limited ammo capacity, and you're not going to have time to grab extra shells if you hear a bump in the night. Having those extra shells already mounted to the gun gives you the opportunity to reload, which could be a lifesaver in a hostile encounter. This product surprised me with its quality and price point. It works great, fits great, holds up well under heavy use, and looks awesome to boot. Buy one - you won't be disappointed. It will fit the Mossberg 590 shockwave. Be sure to order the correct version - there are options for 12ga and 20ga. In order to install this product your shotgun must have a drilled & tapped receiver - in other words, little flat-head screws running down the top centerline of the gun. You may consider installing a larger front sight, because this product adds a little extra height to the receiver, and may make it difficult to aim with a standard bead... or just get a red dot and install it on the rail. Also consider using loctite when you install to prevent the screws from loosening under strain from recoil.

I have a Mossberg 500 ATP with an H code series number which indicates it was made in 1983. I didn’t look at it prior to ordering this side saddle. Unfortunately my receiver is not drilled or tapped for mounting this product. The product is well made and has all the appropriate screws to mount on a drilled and tapped receiver. I was disappointed it didn’t fit. I returned it to Amazon with no problems, and bought a sling which holds 15 shells. Great product buu check your 500 receiver for screws before you order. This does not fit all 500’s.

The saddle looks good and the fitment is perfect. The shell holders are tight and shave the plastic off the shells when loading. Questionable durability on the shell holders. The pic rail is good quality for the price , hold 6 shelms neat and snug.

Works great,Easy install and fit was good.

Good quality

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.