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A Closer Look at 4 of Our Top-Selling MCK Accessories

A Closer Look at 4 of Our Top-Selling MCK Accessories

Posted by MCS GEAR UP on Nov 5th 2025

Micro conversion kits make it a snap to effortlessly convert your handgun into a carbine-style platform, akin to an SBR, without making any modifications to the gun whatsoever.

But this post is not here to extol the virtues of micro conversion kits. For that, you can explore our previous post, Basically Everything You Wanted to Know About Pistol Conversion Kits.

Rather, we’re going to take a closer look at 4 of the top-selling MCK accessories we sell here, and what makes them so valuable.

They might not be the most exciting of MCK accessories, but they do deliver value.

MCK Thumb Rests

Our MCK thumb rests are among the best selling MCK accessories on our website, and are so popular they’re also bundled into some of our kits.

Despite the fact that they’re not as exciting as other MCK accessories like a laser sight or a red dot or even a flamethrower, shooters vote with their dollars and they vote overwhelmingly for these thumb rests.

The simple reason for this is that they overhaul the handling and ergonomics of the micro conversion kit itself. These are small platforms with not a lot of purchase for your hands, especially if you have big hands. These MCK thumb rests solve that potential issue.

Even if that weren’t the case, they help prevent your hands from sliding forward on the platform, and on top of that, they make handling more intuitive, comfortable and confident, especially in the dark or when you’re wearing gloves.

All in all, these are some of the best upgrades you can make to a micro conversion kit without even breaking 20 dollars.

MCK Glass Breakers

glass breakers

It’s kind of a shocker that our MCK glass breakers are as popular as they are, but you can’t argue with the people, and once again they’ve voted with their preferences. These glass breakers are among the most popular MCK accessories we sell here.

This is another relatively affordable MCK accessory and one that also serves an important role. See, though they are technically glass breakers, there are times when you might just need to be able to strike something.

You don’t want to use your gun for that, not the gun itself, if you can help it. That’s where the value of one of these MCK glass breakers comes into focus.

Whether you need to break glass, some other hard object, or you just need to be able to concentrate the force of a strike, these glass breakers are the perfect attachment, and like MCK thumb rests, they’re relatively affordable.

MCK One-Point Slings

If you’re not familiar, one-point slings are all about weapon retention than they are about transporting the platform, as in the case of a two point sling.

As the name suggests, a one point sling attaches to the platform at only one point. The whole idea is that if you have a jam or run out of ammo, and need to drop your weapon to reach for a sidearm, you won’t lose it.

Another big selling point of a one-point sling is that it makes it harder for an opponent to take your MCK away from you.

You can get these MCK accessories bundled with a few others if you’re interested in more than one and want to save a little on the upgrade.

MCKFL Integral Front Flashlights

mounted light

Lastly, we have these MCKFL integral front flashlights that really offer a lot of value. In this industry, we have a saying: “what you can’t see can kill you.” It’s unfortunately true and one of the reasons that a WML, or weapon-mounted light, is one of the most important upgrades you can make to a PDW.

Built around the Olight Baton, these MCKFL attachments come with an adapter to render them compatible with micro conversion kits and boast a 500 lumen rating, for powerful light in the darkest places. They also sport an on/off switch on the side so you can turn on - or kill - the lights as the situation requires.

Also, since these can easily be removed from the CAA MCK, they offer a lot of general utility as well. There’s a reason that so many people carry flashlights in their EDC rotations, and with an MCK accessory like this, you’ll never be without a light.

Explore These and Other MCK Accessories Here

One of the best things about this  particular assortment of four MCK accessories is that you can make most of them and don’t have to pick and choose.

Other top picks (in terms of popularity) from our catalog include stocks, brass catchers, charging handles, and more. Check out our full collection of MCK accessories here on our website and get in touch with us at Sales@MCSGearup.com if you have any questions before you buy.