These are great! I can confirm they fit on a Sig Romeo 5, Primary Arms micro red dot, and the Vortex Sparc AR red dot. They snap on easily and will not come off. Ironically, the Sig Romeo 5 has the smallest shoulder for these to hold on to. I don't think I'll run them on that. See pics.

The KEMIFON Red Dot Lens Cover is designed to offer protective coverage for your red dot optics, specifically the Romeo5 and other red dot sights with an 28mm outer lens diameter. If you're an avid shooter or someone who frequently uses optics for hunting or target shooting, having a durable and easy-to-use lens cover is essential for maintaining the condition of your red dot sight. Here’s a breakdown of its features and performance:Key Features:Durable Construction:The lens cover is made from high-quality materials that are designed to protect your sight from dirt, debris, rain, and scratches. The build feels solid, offering a reliable layer of defense against the harsh elements in the field or at the range.Flip-Up Design:The flip-up mechanism allows you to easily open and close the cover with one hand. This is especially useful when you need to quickly engage your sight and don’t want to waste time fumbling with a traditional cap. The flip-up design ensures that you have quick, unobstructed access to your optics when you need them.Compatibility:The KEMIFON lens cover is designed to fit 1x20mm red dot sights with 28mm outer diameter. It is specifically compatible with popular red dot optics like the Romeo5, making it a good choice for those who use Sig Sauer red dots. It fits snugly on the sight, ensuring it stays securely in place even during rough use.Protection Against Environmental Factors:Whether you're shooting in rainy, dusty, or sunny conditions, the lens cover provides essential protection. The durable material keeps the lens shielded from harmful elements that could impair your view or degrade the quality of your optic over time.Easy Installation:The installation process is straightforward, and the lens cover can be easily mounted without any tools. The fitment is tight, ensuring that the cover doesn’t accidentally come off during use.Compact and Lightweight:The cover itself is compact and doesn’t add much weight to your red dot sight. This makes it perfect for those who value lightweight and minimalistic gear without sacrificing protection.Pros:Reliable Protection: Keeps your red dot lens safe from scratches, dirt, and environmental elements, especially useful for outdoor activities like hunting and tactical training.Quick Access: The flip-up design makes it easy to access the lens when you need it, without having to unscrew or remove the cover completely.Compatibility: Works well with Romeo5 sights and other optics with similar dimensions. If you have a 28mm outer diameter red dot sight, it should fit seamlessly.Easy to Install: The installation process is hassle-free, and you won’t need tools to secure the cover onto your optic.Lightweight and Compact: The lens cover adds little weight, so it won’t affect the performance or balance of your red dot sight.Cons:Limited Compatibility: The lens cover is designed specifically for 28mm diameter optics like the Romeo5. If you use red dot sights with a different size or design, this cover may not fit.Flip-Up Mechanism Durability: While the flip-up design is convenient, it may wear out over time with frequent use, especially in harsh environments. The hinge could potentially degrade after extensive use, though this will vary depending on how it's handled.Conclusion:The KEMIFON Red Dot Lens Cover offers a solid and convenient solution for protecting your optics from the elements. Its flip-up design, easy installation, and durability make it a great accessory for anyone using a 1x20mm red dot sight such as the Sig Romeo5 or similar optics.Who Should Buy It?This lens cover is ideal for anyone who owns a Romeo5 or another red dot sight with a 28mm outer diameter. If you need extra protection for your lens and appreciate a quick-access design, the KEMIFON cover is an excellent choice for outdoor shooting, hunting, or tactical use.Final Verdict:Overall, the KEMIFON Red Dot Lens Cover provides the right balance of protection and convenience for your optics. If you’re looking for a functional and well-built protective cover for your 28mm red dot sight, this is a solid option worth considering. The only downside is its limited compatibility with other red dot sizes, but for those who own the right optics, it’s a dependable and easy-to-use accessory.

I was hoping these would fit my Primary Arms Microprism that I have but they did not. That is no fault of the manufacturer, however. The caps seem to be made well. I do wish it had a more responsive open/close mechanism, but for the price you really can't complain as other caps are much more expensive. If you are looking for a decent pair of lens covers for your red dot, these will do the job. Just check the specs on your particular sight to make sure these will fit.

The Romeo 5 comes with a very basic bikini-style lens cover, but you've got to do something with it when you take it off. With these, you just flip them up and you're done. They fit the Romeo 5 perfectly and securely. They're not coming off unintentionally. The spring is definitely strong enough to pop the lens cover up and out of the way.Overall, I'm happy with them. I put a Romeo 5 on a Crossman full-auto BB gun so I wasn't going for super high quality. The one thing I would improve would be to add a lever for the front cap that you push. My aluminum Leupold caps both push to open because the front cap uses a lever to open. With these, you push the front, but you need to pull the rear. This is nitpicky though because the Leupold caps alone cost more than the entire Romeo 5. I wasn't expecting that level of quality with these.If you're looking for a good basic cap, these will do the job. It's only for a Romeo 5 so you're not getting something aluminum with waterproof O-rings.PACKAGING:They come packaged in a tiny little box, but once you install them, you're not taking them off or storing them so that's fine.FITMENT:They fit very snugly and securely on a Romeo 5. As long as they don't stretch or deform in the heat, they're perfect.QUALITY:Given that they're designed for a budget red dot, they're good.VALUE:Good value for a decent set of budget caps.

The advertisement said this is for the Romeo 5 brand but I measured my Holosun optic and decided to try it out. With an outer circumference measurement of 28 mm, and weighing almost nothing, my optic was the perfect host. The covers fits perfectly, snapping on tightly and doesn’t fall off.My wife wondered why I would need these covers when the Holosun already had the bikini type covers. After installation, she understood (and was very impressed by) the usefulness of the quick flip up covers. They are a good quality plastic and I expect they will greatly outlast the rubber covers that were original to the optic.Overall, these are great value, I am quite happy with this item and would recommend it to a friend.

This accessory fits perfectly on the Romeo5. It is a friction fit, but won’t go anywhere without you intentionally taking it off. The caps are spring loaded for quick deployment, and to ensure they do not interfere with the optic. I have mine oriented to flip down, not up, so it does not obscure any part of my vision.

I’m one of those picky gun owners that leaves the rubber protector on the red dot sights when I’m not using it.One of my guns came from the factory with these flip up lens caps and I love them. No wondering where you left the rubber lens covers.I was skeptical when I took these out of the box and compared them to my Romeo 5. One end on the Romeo seems to have lots of space for these to slip over. The other end appears to have a very tiny lip so I was really surprised that these actually slip over that and stay secure. Both ends work great and have not even come close to coming off yet.