Monstrum Rubberized Flip-Up Rifle Scope Lens Covers

Been looking for a cover for my night vision scope which has large optic. Cover fits great! Looks factory. Good find!

works great fits nicely

Good budget-friendly scope covers that do the job. Easy to install, fit well, and provide solid protection against dust and dirt. The flip-up design works smoothly, but the rubber may wear over time. Great for casual use, though not as durable as premium options.

Bought a set of these for my Leupold Freedom RDS (size 37-42). Nice snug waterproof fit. Clean snap of the rigid plastic cap when opening and closing. For the most part I liked it. It seemed like solid protection for my red dot at a good price. Unfortunately, both lens covers looked identical and I couldn't tell the difference (if there was one) between the eyepiece cover and the objective lens cover. When I put them on it made my big red dot look even more massive so, I gave one away to a buddy and kept this one on my objective lens (the objective lens on the Leupold RDS is 40mm). It lasted about a year before it split at the seams. The gun has only been used at the range and then stayed in my safe so, the lens cover hasn't been put through any challenging paces. Maybe I put the wrong cover on the wrong lens, who knows. It would be helpful if Monstrum would label the covers so one can know which cover goes to which lens. Still, I got a year of use out of it and for the price I guess I got my money's worth. I contacted Monstrum and they told me that they would replace it if I send it back to them. Their warranty is still good.

Fine product but make sure to measure the objective and eye piece outer diameter with calipers. If it's on the border you might want to go with the smaller one. For instance, if it measures 43 mm, you might want to go with the 42mm one for tightness. I bought one for a Vortex scope that measured 43 mm, but it was slightly loose and could fall off. I purchased a 42 mm one to replace it. Since the ends are rubberized it will stretch a little. I'm not sure if something happened to make it bigger or what...it's not Monstrum's fault and I'm not blaming their tolerances since it was right at the beginning of the range of the next bigger size.

Before you order, make sure you measure. A millimeter matter. We work as advertised.

These technically work fine, but they don't leave me with a lot of confidence. I've had these for almost six months to the day on two rifles and the rubber is pretty much done; all four caps are split and warped. I shoot most weekends and my guns live in air conditioning, but these things look like they've been through a few tours in kandahar. That being said, they stay on my scopes just fine and flip open nicely. The lens cover is big enough to hold a small DOPE card. As far as functionality, they're exactly what I was looking for, but I just don't see these things lasting through a year of use.

I used a micrometer to measure the OD of my scope: objective=48mm, eyepiece=42mm so I ordered the 43-48 and 37-42 lens caps. There was no way I could fit the 43-48 cap on my 48mm objective! (Maybe if you clamped the rifle in a vice and applied some serious force or used lube.) Surprisingly, the 43-48 lens cap fit quite nicely on the 42mmm eyepiece with no chance of falling or getting knocked off. It was not too difficult to remove, which is a plus in my case since the variable power ring is on the very end of the eyepiece. So, if your scope diameter is close to the upper end of the specified range you might want to consider getting the next size up. One more minor quibble is that the cap seems a little too easy to open. The friction fit is controlled by tiny grooves on the ID of the lens cap, so if it's a problem I suppose you could add a tiny drop of glue or something to the OD of the flip-up lens cover. Even with the above caveats I consider this a a good lens cap for the price.