The Strike Industries Jellyfish RMR Cover is one of those must-have items if you own a Trijicon RMR.

When you spend upwards of $500+ for an optic, it’s never a bad idea to spend just a little bit more on a product to protect that investment.

The Jellyfish RMR Cover is specifically designed to fit very nicely around the standard and adjustable brightness Trijicon RMR red dot sights. The Jellyfish will not fit over dual-illuminated models, so be sure to double check what kind you have before you place your order.

Trijicon RMRs that will and will not work with the Strike Industries Jellyfish cover

The overall design and concept for the Jellyfish are simple – protect the RMR while also allowing the user to still see the red dot inside the RMR to effectively shoot while the cover is installed. 

It’s also elegant and well thought out, minus a couple of issues that I’ll talk more in-depth about in a moment. The fit and finish of the Jellyfish are very nice, and it snaps securely over a Trijicon RMR by using two small indentions on the sides of the Jellyfish that interface with existing holes in the sides of the RMR. In theory, it’s a great idea.

Strike Industries Jellyfish RMR cover viewed from the front

Photo Credit: strikeindustries.com

Strike Industries Jellyfish RMR cover

Photo Credit: strikeindustries.com

Where things start to go wrong for the Strike Industries Jellyfish are the lack of actual transparency and the fact that, if you have a fairly standard RMR setup on your pistol, you will have to modify the Jellyfish in order for it to fit correctly.

Shooting through a Trijicon RMR at a steel target
Shooting through the Strike Industries Jellyfish at a steel target

As you can see from these two pictures, the RMR without the Jellyfish installed is clear, and it’s easy to see through it. As soon as you put the Jellyfish on, however, that nice clear sight picture turns into a very dark, cloudy image of the dot. 

It’s so difficult to see through, that you will have to keep both eyes open if you want any kind of chance at actually hitting where you’re aiming. Shooting an RMR with both eyes open isn’t a new concept, but the total lack of any kind of transparency through the Jellyfish is honestly quite disappointing. 

The second issue I have with the Strike Industries Jellyfish is the fact that I had to modify it, in order to fit my RMR correctly. As you can see from these pictures, I used a Dremel tool to carve out a notch that would fit my rear iron sights correctly.

Modifying the Strike Industries Jellyfish with a Dremel tool
Cutting a rear notch in the Strike Industries jellyfish to fit over rear iron sights

Both the fit and transparency issues should be an easy fix if Strike Industries just tweaks their formula for the plastic and adds a rear sight notch in the mold. With these two problems solved, it would be a fantastic product. 

If you’re running a Trijicon ACOG with an RMR on top, I would definitely recommend the Strike Industries Jellyfish for that setup. Since the RMR is not used that often and is the highest point on the rifle, it will tend to get knocked around more often than other parts. The Jellyfish would be a great solution to help prevent damage in that case.

Trijicon TA31 ECOS with RMR on top

Photo Credit: trijicon.com

As it is now, however, I give the Strike Industries Jellyfish a 3 out of 5. If you have an RMR, it’s worth the very reasonable investment of around $12 to pick up a Jellyfish. Just don’t plan on keeping it on your RMR-equipped full-time carry gun.