Monstrum Low Profile Picatinny Riser Mount (0.5" H x 5.7" L), for Scopes and Optics

Good quality. Fitment was exact. Installed in seconds. Used it to tie two planes together as one, rather than a riser. Serves the purpose perfectly.

Works perfectly.

This riser seems to be well made and accurate in its dimensions. It fits perfectly on a Bushmaster AR and raises the scope almost perfectly to eye level. The thumb nuts allow it to be securely attached, and I foresee no problems with anything coming loose. It's a good product for a good price.

Monstrum Low Profile Picatinny Riser Mount (0.5" H x 5.7" L)Precise, solid, .5" high riser. Just what I needed to bump up my scope height.The riser I received was different than that shown in the product description photos. It did not have the "Monstrum" logo printed on it, (I am Ok with that) and the mounting nuts are hex nuts, tightened with a wrench, not the knurled thumb knobs shown in the pic. I am also Ok with that.This works for my needs. Price seems fair.

Good quality perfect fit for picatinny rail

Was perfect

My DPMS Oracle is a basic low-end rifle that I intentionally purchase with an eye toward building out paying attention solely to weight and secondarily to cost.One of the challenges of my Oracle was to transfer my AimPoint Red-Dot Pro and Vortex VMX-3T magnifier. The Oracle has a 5" picatinny but the fore grip is a MOE style plastic grip with no rail. The height of the fore-grip is higher than the picatinny and the combo Red-Dot and magnifier will not fit on the picatinny alone.This low profile riser raises the height of my red-dot to a point above the height of the fore grip. Now by simply installing a light weight picatinny on the top of the fore grip for the magnifier, I will have both sitting one in front of the other and ready for use.

It would be better if this product had deeper slots in the thumb nuts. The slots, as they are, are not deep enough to fit any kind of coin or screwdriver in order to really tighten the nuts down. After tightening as much as I could based on finger strength alone, the nuts still came loose after about 20-30 rounds of .308. This meant that the rail could "wiggle" about 1/8" forward or backward - not enough to really make a difference, but still annoying.The solutions are, of course, to either a) loctite the nuts in place or b) use a wrench or something to clamp them down. But both options make it difficult to remove the rail (especially without a tool) if you need/want to. Instead, a deeper slot would allow you to clamp it tight with a coin and also loosen it with a coin, for instance.