The Glock 21 is one of the longest standing semi-automatic weapons in continuous production for the proven Glock line.
It offers a significant caliber, legendary reliability, and plenty of firepower. But it is a bit hefty, with the beefed-up slide and a thick grip profile. This is an article that addresses finding a perfect Glock 21 holster for your carry needs.
The best Glock 21 Holsters are going to be more versatile because the shooter that chooses a .45 ACP Glock 21 over other guns probably has multiple uses and needs in mind. This means you will either be looking for multiple holsters or for one that can handle multiple situations without skipping a beat.
Best Glock 21 Holsters Comparison Chart
What Makes a Top of the Line Glock 21 Holster?
Build quality, brand name (because of credibility and history), versatility, and material type are all important factors in determining the right holster.
Just like the Glock, a holster that will do it justice will be well-built from a material befitting of the task, by a company that knows how to deliver quality.
Innovation can also be incredibly important. But not just for the sake of innovation; the innovations should make sense for a majority of shooters.
Here is where the rubber meets the road for holsters.
Mostly, holsters are a traditional, old-school offering, but Kydex, from a material perspective, and forward-thinking companies, from a design perspective, have reinvigorated this market into something that has gotten an incredible amount of attention in the last few years.
These aren’t the only innovation in the holster space either. “New takes” on old-time carry methodologies have given a platform for consumer interaction that has bred conditions that help all consumers find more of what they are looking for.
A note on materials, because they play such an important role in picking a holster style:
Kydex and leather are the ruling elite as of right now, but polymers are also a popular choice.
Some of the favorite fabric choices of years past have taken a back seat to these other materials, but still offer certain benefits the others cannot, like soft, easy to wear characteristics that only fabric can provide.
Kydex gives you the custom, form fitted, thin profile that has retention and lightweight at the forefront of its design theory.
Leather gives you the natural, time-tested proven results that only leather can provide, including great fit to your body and good wear characteristics.
Polymer is more well-suited to the fast and secure crowd, like competition shooters (which the Glock 21 is no stranger to) but may not be a perfect choice for most concealment conditions because they are not the top choice for rigidity or for lean profiles, so pick a better choice whenever you.
That doesn’t discount polymer choices at all, they are excellent for duty, competition, and open carry where security and consistency in drawing is very high demand.
Situational Holsters – Which is Ideal for Your Glock 21?
We have added a section called “What it’s best for” under each of the reviews for this article. This will help to explain the situational values for some of these holsters. They might fit your needs.
For a primer, before you read the reviews, you might consider our brief overview of the different scenarios/holster types that will make sense for the large framed Glock 21.
Carrying a Glock 21 with a fixed light or external laser device
You will want something that does not interfere with the draw of the weapon, and which will be protective of the light or laser device.
This is a good fit for duty weapons or those who must carry on larger, darker properties or at home and want to add light or laser capabilities to their carry rig.
Carrying a Glock 21 IWB
IWB can be very uncomfortable for some carriers, especially those who sit a lot. It is even more uncomfortable for a Glock 21 owner who carries this firearm.
For standing use, an IWB holster can be ideal for most people, but If you are carrying in an office work environment, you might consider opting for a different style.
If you have a big belly or are super skinny and don’t want a gun riding hard against your hip bone, similarly, you should look elsewhere for a holster style, with the exception of the holsters we list in our article below (there are a few IWB’s on this list that are amazing).
Carrying a Glock 21 in a pocket
The point of inclusion in this section for this holster style is to unequivocally rule it out for the Glock 21 for most people.
It simply doesn’t make sense to try to pocket carry a G21 as the size and weight fully loaded would be ridiculously prohibitive and could cause safety and movement concerns (see the exceptions below in the review section).
Maximizing comfort for those who must carry a Glock 21 while sitting down
A shoulder holster rig can help to maximize comfort by distributing weight and carrying the bulk of the Glock 21 against the widest part of your body for decent concealment and better running ability.
Review of the Best Glock 21 Holsters
The following reviews represent the finest available options with specific details about why they are such a good fit for your Glock 21 and your needs.
1. Best Glock 21 Holster with Light: R&R Holsters OWB Kydex Holster
This Kydex holster features a build that incorporates the use of a top-quality light into the design, and still maintains a good, consistent, small footprint and lightweight profile at the same time.
It’s an outside the waistband holster that wears like an IWB because of the curvature and the positioning of the gun. It helps to ensure a quick draw, with little to no downside and a safer re-holstering effort.
This is a perfect choice for such a big gun, without having to move to a different holster position. This is a well-built, highly durable holster that utilizes one of the most innovative holster materials ever conceived.
Its positive retention, easy draw with an accessory light, and very simple design means you are getting a very well-rounded holster that offers a ton of versatility for the money with safe re-holstering capability.
2. Best Glock 21 Concealment Holster: Galco International - Concealable Holsters
The fixed design features a leather build and is a classically positioned holster that works well for bigger, heavier guns, like the Glock 21 in relation to other pistols in the personal defense market segment.
The Galco brand name is synonymous with uncompromising standards and top-tier production quality, as well as significant heritage and holster reliability.
If you want an OWB hip holster in leather, there are very few that can compete with the solid styling and safe retention of this holster.
Rest assured you are getting industry best practices in production and design that has superseded innovation and has become THE STANDARD.
This, in a holster that is traditional, relatively lightweight, and still offering a good amount of rigidity without sacrificing much-needed carry flexibility from a torsional perspective.
The proven design offers optimum angle for draw from a seated to standing position and sure retention and trigger coverage.
3. Best Glock 21 IWB Holster: Concealment Express IWB Kydex Holster
All the best of the Kydex revolution in a single holster. This type of holster design is the reason that Kydex has taken off.
It has all the features you need, without any of the extras that won’t make sense for 99% of all concealed carriers.
Minimalist in design and big on actual functionality, the intuitive design of the Concealment Express IWB holster gives you a legitimately safe, easy-to-use holster for a big gun.
This holster has a sight channel to protect your draw from snagging and a small form-fitting footprint holster that covers the trigger guard fully. It’s features like these that make this holster a rock-star.
A beautiful design that transcends functionality and is also stunning in form The simple, minimalist design is a trademark of the company, but this particular holster wins the user over immediately because of how versatile this “minimalist” holster actually is.
It offers a simple, easy adjustment, with an excellent close molded fit, smooth draw capabilities, and a seriously lightweight design that feels effortless inside your waistband.
4. Best Glock 21 Leather Holster: Relentless Tactical The Ultimate Suede Leather IWB Holster
A sleeve styled fit that hugs the gun in the correct position and offers a bit of “friction” by way of the surface texture of the interior leather material.
This is simple but still offers just about everything you might need from an inside the waistband holster without the high price of competitor products.
While the Glock 21 may not be an ideal IWB candidate for every concealed carrier, this would be a top candidate if you can do it, because of the relative comfort, high retention design (while under pressure), and the smooth draw functionality that the semi-rigid leather design offers.
Serious craftsmanship for the price point, legendary customer service, and reliability of the Relentless brand.
This is a premium version of a versatile multi-gun holster that can retain a firearm without difficulty while under pressure, but also doesn’t have the stabbing, biting rigidity of some other IWB competitors.
5. Best Glock 21 Kydex Holster: Fixxxer Custom F.I.X. Holster by Components Fits
The simplest holster you will ever work with is essentially not a holster at all, but may offer some of the best universality and versatility of any holster-like accessory.
For pocket carry (which we feel is a hard proposition with the Glock 21) or use in a fanny pack, backpack, or other bag, this is a safety implement that cannot be overlooked and whose viability should not be understated.
This tool will render trigger-safety-based firearms without a manual exterior safety and are safe and fast to draw if you understand the nuances of the piece.
It is a simple Kydex based option that fully covers the trigger, where many other holsters do not.
It offers the type of situational carry that otherwise would be extremely unsafe and could lead to a negligent discharge or worse.
Worth the money and especially for the peace of mind it can give for IWB or bag/alternate carry positions, including in-car mounting of soft holsters. The cord can be secured to anchor points to ensure single stage draws that are ready for action immediately without two hands.
The main draw here is the low price point to render your trigger-safety-based pistol much safer than it previously was.
Simple, small, and not particularly impressive in looks, this is a tool that can help many draw styles and firearm types to be safer and offers a smart option to pistols of all types.
Snug fitting and positive in its engagement, this is a tool that is built to perform reliably without hiccups.
6. Best Glock 21 Holster Runner-up: DeSantis Mini Slide Holster fits Glock 21
This is a great OWB (outside the waistband) holster that has been proven for decades as a perfect choice for larger, harder to conceal firearms that are hard to fit on the interior side of your belt.
The Glock 21 is a perfect mate for this style of holster, which gives a lot of positional flexibility because of the slide style design.
It’s available in left or right side configuration, offers a couple of different leather colors, and the angled draw and the away from the hip placement of the firearm makes it easy to draw.
Don’t mistake this for a hard to conceal firearm holster though, it is form fitting and built to fall on the hipline well, making it easy to carry big guns without a lot of printing.
Paired with the right wardrobe, this is a masterful holster choice and can easily disguise a big gun like the Glock 21.
Desantis is very good at producing winners in its staple of offerings. This is a proven design that has received a lot of praise over the years because it does exactly what it says it will do, and there are no shortcomings from a build quality perspective.
The leather work is top notch and the holster, while not particularly adjustable, is 100% reliable and consistent on the draw, which means you won’t struggle with draw missteps or snags once you practice with it.
The near-perfect rigidity of leather in this style and of this quality means you get the reflex that you need to ensure performance in a life or death scenario. There are no compromises here.
7. Best Glock 21 Holster Second Runner-up: Concealed Carrier Universal IWB Holster
A soft-sided, high end carry solution that lends itself well to a couple of different scenarios, including IWB, in-bag, or other situational carries, as well as fanny pack or alternate waistband solutions.
This holster is also very good for appendix and back carry, with the caveat that it is not a very rigid device and the re-holstering/draw can be a bit more complex as a result.
If you prefer a softer holster, this is a very good choice, and the drawbacks are known up-front and aren’t as numerous as many other soft holsters on the market in the same segment.
The Concealed Carrier brand IWB soft-sided holster is a versatile holster that can offer a lot of options if you need a secondary holster, or for those that do not carry full-time.
It’s recommended that you utilize a more rigid holster if you routinely carry next to the body and want draw consistency.
The comfort of the holster and the universality it offers means you get a lot for your money, even if it’s not a perfect fit for all draw styles.
It is a very nice addition to any shooter’s collection and will give you unmatched bag or pocket carry versatility for the money.
8. Best Glock 21 Holster Third Runner-up: Aker Leather 101 Comfort-Flex Shoulder Holster
Weight distribution, running comfort and seated or driving comfort for those who must carry a larger firearm (like the Glock 21 .45 ACP) all day.
The innovative design and materials of this shoulder carry rig are made for intermediate concealment needs where comfort and functionality take precedence over the full concealability potential.
This Aker shoulder rig is a beautiful reminder of the reasons someone courts a relationship with a shoulder holster in the first place: comfort.
The holster implements even more comfort driven design innovations than most competing shoulder holsters on the market.
The wide straps and great adjustability, as well as the slightly curved holster pieces, make this a true pleasure to wear under a jacket.
You are getting a top-quality piece of equipment for your concealed carry needs, that exceeds most open market alternatives at the price point, and is made to a high standard of quality.
The market for heavy-gun shoulder holsters only has a few ready-made offerings; this is among the best that won’t require waiting months for a custom variant.
This is also exceptionally comfortable, and while it lacks a tiny bit of the durability of some of the custom options, it is also ½ to ⅓ of the price of a true custom made product.
Whether you need a first holster or an additional holster for your Glock 21, you can consult this list without any worry that you will be steered wrong.
The individual and cumulative quality and value on this list of reviewed holsters for the Glock 21 (and other similarly sized firearms – for example, the Glock 20) are unmatched.
Knowing these guns represent a traditionally difficult-to-buy-for footprint and profile size, this is a list of special offerings that will give you exactly what you need, based on your unique use cases.
The Glock 21 represents something of a special category on the market as a high capacity, high-reliability, “big bore” pistol that is still applicable to many carry situations.
Similarly, these holsters offer a good mix of pertinent features, design implementation, and innovation that make them stand out in a saturated market full of holsters that are just OK. These also represent a special market segment: they are the best Glock 21 Holsters available on the broader market.