Monstrum Piggyback Picatinny Ring Mount for Rifle Scopes

Good quality. Works in a pinch on a shotgun tube for light mounting.

Great product highly recommended

I would give this product a perfect score but unfortunately I can't. I decided to use this on-top of a scope I had for a .308 build I have been working on. I used a budget GDS and zero'd it at roughly 50 yds since the scope I was using wouldn't perfectly sit on the crosshair for anything less than 100yds. After having zero'd everything I went to turn the GDS off and noticed it was wobbling considerably. Took me a minute to trouble shoot but eventually discovered the picatinny mount for the rings wasn't tightened properly and walked loose after only 4 shots from a .308. What was even more annoying was there was no included allen wrench hardware to loosen/tighten the picatinny mount, just the rings to the host scope. I had no choice but to remove the piggyback mount and fix it when I got home. The fix was simple and some blue loctite ensures it won't walk loose again but it was a big inconvenience at the time of shooting on the range. 4/5, make sure you check your screws holding down the picatinny mount before ever mounting it to a scope!

Dimensionally correct, decent quality and decent price.

Surprised with the quality and durability. I have it mounted on a 5.56 and it hasn't come loose or given me any issue's

Build quality seems ok so far, however, after mounting a Holosun red dot and taking it to the range, I soon found that the red dot was loose. It was the rail on the top ring half. The rail is mounted via two screws and they had backed out due to the recoil. There was a tiny amount of loctite on the screws, but it wasn't enough to hold the screws in. I have since applied more loctite, but haven't had enough time to go to the range again. Hopefully the loctite solves the issue.

So the mount has a few big issues, first it’s ring diameter is just a tad too small and may crush your scope if not careful. But the other huge issues that had rendered the item useless is the junction on the top ring where the 2 screws hold the section of picatiny on top, well it completely snapped in half from 20 lb/in on the 2 screws. This is nothing in regards to torque, whatever aluminum this is if it even is it could be zinc, is terrible. And you have to torque the pic rail I tried it lightly hand tight and it wobbled once ring was torqued, so I tried 10 lb/in, then 15, and at 20 it just broke right in the middle along the 2 holes. 20 lbs/in is nothing, I’m not even gonna bother returning, I am trying jbwelding the two pieces together to the rail with screws in and I have more faith in the job weld holding than the original product. 20 dollars I can chalk up to science for the masses. I’m gonna buy a trijicon mount instead. The picture is after I’ve applied jb weld

Bought this to mount phone to crossbow so I could record Hunting video's. Typically I would have to put my bow down, pull out my phone to record deer that are walking past my stand. This held the phone mount well. Screws all lined up perfect and securely tightened down on the scope.