Monstrum Mossberg 500/590/835/930/Shockwave Grimlock Picatinny Rail Mount

Fits Mossberg 500 perfectly. Several review have stated it interferes with the safety. This is impossible unless you are dumb and put it on backwards. If this is you please seek the help of a gunsmith. For the rest of us non-idiots this mount works great.

Well designed and works perfectly for my Mossberg 835.

This is a perfect fit for a Mossberg 500. The profile of it gives a nice seamless look.

Monstrum has usually made really quality parts at a good value. Fits my Mossberg just fine, pretty straight forward and adds quite a bit of functionality to it now because i can add optics to my home defense tool.

Piece of cake to install. Works great

Mossberg 500 20 gauge, fit perfect. The screws were the same thread pattern as the pre tapped holes on the gun. The gun is more accurate with sabot slugs now than it was with the saddle scope mount

I considered this scope rail because it has a wider footprint and in theory, would mount flat and strong. In reality, it’s not flat and doesn’t fit a Mossberg receiver. When you tighten the screws down, the gap between the rail and receiver closes which bends the rail into a banana. Fortunately I had the tools available to make this fit. Look elsewhere if you want a rail that fits without modification. Otherwise it is a really nice rail if it fit right.

Great product excellent service