Flux Defense Pistol Brace and Flashmag for Glocks [Review]

first published on October 17, 2019 by


What if I told you a company called Flux Defense made something that could transform your Glock? A product that took your every day carry handgun, and turned it into something that could reliably hit targets quickly and accurately out to 100 yards.

You’d probably think I was lying, or that there was an ATF paywall you had had to hurtle. I’m not lying, and there is no catch. Let me introduce you to the Flux Defense Pistol Brace and Flashmag.

Who is Flux Defense?

Flux Defense Glock Cover
Flux Defense is a Utah based company that creates innovative products for firearms. Founded in January of 2019 by a small group of inventors, they designed the Flux Defense MP17 system to improve the self-defense capabilities of the average handgun. All of their products are designed and manufactured in the United States, and they have zero intentions on ever changing that fact about their company.

Innovation is scary in the firearms world. Whenever something new comes out, there is always individuals who jump on the nay-say train. Their flagship product, the MP-17, aims to replace the personal defense weapon of military, law enforcement and civilian security contractors who work in a capacity that requires them to work with a PDW. Some average shooters failed to see the need for the system, and wrote it off as another gun gimmick.

Their video for that product broke 8-million views on Facebook, and while some people can’t see the purpose or vision, those who do are quickly jumping on board as the product is selling out faster than the company can get it in stock.

Meet the Flux Defense Brace for Glocks.

Flux Defense Brace

The Flux Defense Brace for Glocks gives the shooter an optional arm brace or cheek rest when firing. This spring-loaded, rapid deploying system adds little weight or extra length to the Glock. It attaches to the Glock by using the back strap pinhole. When stowed, the weapon can be easily concealed with the company’s holster.

In order to deploy the brace, there is a depression switch near the slide release of the weapon. Hitting this switch triggers the brace, causing it to push out the back for rapid use situations.

You can purchase the Flux Defense Brace in either right, or left handed configurations for the Glock platform. It works with all Gen 4+ Glock 17s, 19x, and 34s. The only stipulation with the Glock 34 Gen 5 is that you are required to change out your slide release in order to prevent it from interfering with the depression switch.

Does this Turn my Glock into an illegal SBR?

The short answer is no. The long answer is still no.

Pistol braces are 100% legal on the federal level, and in most states as well. While some states do have stipulations on items like this, (I’m looking at you Commiefornia) a majority do not. One of the most common questions you’ll see about the Flux Defense product line-up is potential customers asking if they have acquired an ATF letter. They have not.

Fun fact, most braces you’ll find do not have that approval letter from the ATF. Here’s a direct quote from the Flux Defense FAQ.

ATF brace letters are often misunderstood. Most letters actually only specify approval for the recipient and that specific firearm, and yet in practice the braces are used on many different types of pistols such as ARs, PDWs, and handguns (Glocks). If you are going off letters for approval the ATF would essentially have to issue thousands of letters covering each brace on each possible weapon it could be placed on.

Let me say this one time, and one time only. Free men do not need permission slips. Pistol braces are federally legal, that means that the Flux Defense Pistol Brace is a federally legal product. Why would you continuously ask permission from the ATF on the items you want to purchase?

If you’re that concerned about what the ATF thinks of your purchase habits, check out the MP-17 SBR and file your SBR ticket.



Meet the Flux Defense Flashmag for Glocks.

Flux Defense Flashmag

The Flashmag is one of the most interesting innovations we’ve seen in a while. It’s a product that functions as both a light carrier, and a magazine carrier. It’s fully holseterable, and allows the user quick access to their second carry magazine.

The magazine itself is stowed inside of the device by a friction system with cuts. The cuts grab onto the depressions on the outside of a standard double stacked Glock magazine, and keep the item secured in place until the user needs to conduct a reload.

It’s worth noting that if you decide to get a Flashmag, it is best used on the longer Glock models. If you are intending to use it with the G19, G23, or G45, you’ll want to use a threaded barrel, compensator, or suppressor in order to get the weapon’s barrel to extend past the end of the Flashmag.

Is this a Forward Grip that turns my Glock into an AOW?

Again, the short answer here is no. The long answer is still no.

The Flashmag is not a forward grip for your weapon, therefore it does not turn your pistol into an AOW or SBR. The Flashmag is an option that allows the user to carry a magazine forward on their pistol. It does this while also creating an option for the user to maintain a weapon light on their system.

If the Flashmag was a forward vertical grip, then maybe it would turn your Glock into an AOW. That said, the Flashmag is angled at an offset from 90 degrees, which would make it an angled forward grip, if it were a grip at all. Angled forward grips are legal on pistols. Also, see the quote below for a fun fact about AOW systems.

A pistol cannot legally be classified as an AOW, as it is a category for sawn-off shotguns with a short barrel and no stock. The legal definition of AOW does not include pistols with rifled barrels, and thus it could not be classified as an AOW even if it had a foregrip. There are various court cases detailing this – US v. Fix (UNITED STATES of America, Plaintiff-Appellee, v. Lawrence Christopher FIX, Defendant-Appellant. No. 00-10789. August 29, 2001) AND U.S. v. Davis, Crim No. 8:93-106

Flux Defense Pistol Brace and Flashmag on the Range.

Flux Defense Paul SOTG

On the range, this suite allowed us to stretch the limitations of our Glock platform by a lot. Most people see this system and instantly assume that it is some sort of gimmick. We’re not going to lie to you, we thought that as well at first.

What we found out in practice however, was completely different.

Using the Flux Brace system we were able to quickly and reliably hit targets out to 100 yards. Under normal circumstances, doing this with your stock pistol is a feat that only practiced shooters can do. Even then, practiced shooters will take a long time in between shots in order to accomplish this objective.

With the Flux Defense suite, even our less experienced shooters were able to hold tight groups at a much longer range. After using the system ourselves, we are definitely believers.

Final Thoughts on the Flux Defense Brace and Flashmag.

First and foremost, wow. This system really surprised us. After watching their video on the MP-17 SBR, we weren’t fully sold. It took about one magazine with the system to get acquainted to some of the nuances of the system, and after that everything was easy street.

We know a lot of people are concerned because Flux Defense doesn’t have their ATF permission slip, but as we said earlier on, free men don’t need permission slips. If you’re on the fence about this system, get off of it and into the line to purchase. This is the handgun innovation of the year.

Here are some thoughts from Student of the Gun’s experience with the system. If you don’t believe us, go check their video out.

If you’ve had a different experience than us with the Flux Defense system, we’d love to hear from you. Make sure you head down to the comments section and let us know what you thought of your time with the Flux Defense Pistol Brace.