MonstrumLockdown Series Adjustable Height Picatinny Riser Mount | 5.5 inch

I ran several mags through my AR10 using this riser and it worked like a dream. I took it home to move it further back on my rail and one of the bolts snapped in half when I was tightening it back. I contacted customer service and they said they would ship me a replacement asap, and they weren't lying. I received it in the mail in two days. Good product. Good customer service. Would recommend.

This product is great for the money. The only complaint I have isn't so much about the product, but that I made a mistake on my part. The component doesn't fully line up on the railing as it transitions from the upper to the hand guard system. Since I have a rear iron-site installed, I couldn't put this far enough back to properly seat it flush, however, because I'm able to adjust the height from the two screws, I was able to offset the angle enough to level my scope back out. All-in-all, a great product, just make sure you check your railing if you find yourself in the same situation as I did. I ended up just ordering 45 degree offsets for my iron-sites to fit this raiser better for my scope.

OK, when I took this to the range for the first time after several rounds it loosed up, then I had the gunsmith try and torque the bolts and they were stripped.I contracted the manufacture and they told me they would send new bolts and nuts. I waited a few weeks and guess what? No replacements were sent. I contacted them again and now it's crickets, no reply.Update: I never received replacement bolts and nuts but they did send me an entire unit. So in the end they did take care of me which I'm very grateful for, I only wished it was sooner. Updated from one star to four...

It work great thanks

I have several Monstrum risers. No issues with any of them.

This will work perfectly . Been looking for something for awhile.

worked ok

One of the few risers that is adjustable.