Glock 45 MOS Review: Is This Optic-Ready Glock Worth Carrying?

The Glock 45 MOS is one of those pistols that makes more sense once you shoot it than it does on paper.

At first glance, it looks like Glock took a compact slide and stuck it on a full-size frame. That is basically what happened. The Glock 45 MOS uses a Glock 19-length slide with a full-size Glock 17-style grip, giving you a shorter, faster-handling top end with a full firing grip and 17-round magazine capacity.

 The Glock 45 MOS is an optic-ready 9mm crossover pistol that pairs a Glock 19-length slide with a full-size Glock 17-style grip. It offers strong shootability, 17-round capacity, Glock reliability, and red dot compatibility, making it useful for home defense, range use, duty-style carry, and some concealed carry setups. Its main tradeoff is concealment, since the full-size grip is harder to hide than smaller Glock models.

That combination works.

The Glock 45 MOS is not the smallest concealed carry Glock. It is not the lightest. It is not the easiest pistol to hide under a thin T-shirt. But it gives you a lot of capability in a package that still carries better than a traditional full-size pistol for many shooters.

This is a pistol for people who care about control, capacity, optics, and real defensive performance. It fits well for home defense, range training, duty-style carry, open carry, winter concealed carry, and concealed carry users who can manage the full-size grip.

The big question is whether the Glock 45 MOS is worth carrying when pistols like the Glock 19 MOS, Glock 17 MOS, Glock 47 MOS, Glock 19X, and Glock 43X all exist.

For the right shooter, yes. But you need to be honest about concealment.

Glock 45 MOS Review: Quick Answer

The Glock 45 MOS is a strong choice if you want an optic-ready 9mm Glock with a compact slide, full-size grip, 17-round capacity, and excellent shootability. It is easier to control than smaller carry pistols and faster to manage during recoil, especially with a red dot mounted.

It is best for:

Home defense

Range use

Duty-style carry

Red dot carry

Winter concealed carry

Larger-framed concealed carriers

Shooters who want a full grip without a full-length slide

It is not the best choice if your top priority is deep concealment. The full-size grip is the part that prints, and the Glock 45 MOS has plenty of grip. If you need a pistol that disappears under light clothing, a Glock 19, Glock 43X, Glock 48, or Glock 43 may be easier to live with.

The Glock 45 MOS is not a compromise pistol in the weak sense. It is a crossover pistol built for shooters who want a fighting-size grip with a more compact slide and optic-ready capability.

What Is the Glock 45 MOS?

The Glock 45 MOS is a 9mm Gen 5 crossover pistol with Glock’s Modular Optic System.

The “crossover” label matters. This is not just a compact Glock and not quite a traditional full-size Glock. It blends two popular Glock formats:

A compact-length slide similar to the Glock 19

A full-size grip similar to the Glock 17

That gives the pistol a different feel than both the Glock 19 and Glock 17.

Compared to the Glock 19, the Glock 45 MOS gives you more grip, more factory magazine capacity, and better control for many shooters. Compared to the Glock 17, it gives you a shorter slide that can feel quicker out of the holster and more comfortable for some carry positions.

The MOS part means the slide is cut to accept compatible red dot optics using Glock’s mounting system. For modern defensive pistols, that matters. More shooters are carrying pistol-mounted optics, and the Glock 45 MOS gives you that option from the factory instead of requiring aftermarket slide milling.

The Glock 45 MOS fits the shooter who wants a practical defensive handgun that can handle carry, home defense, range work, and optic use without being overly specialized.

Glock 45 MOS Specs, Size, and Capacity

The Glock 45 MOS is chambered in 9mm and uses standard 17-round Glock magazines. It can also accept compatible larger-capacity Glock 9mm magazines, which is one of the benefits of staying within Glock’s double-stack 9mm ecosystem.

The barrel length is 4.02 inches, which puts it in the same general slide-length class as the Glock 19. That shorter slide is part of what makes the Glock 45 MOS feel quick and balanced.

The grip is the bigger story. The Glock 45 MOS uses a full-size grip, giving most shooters a complete firing grip with no pinky hanging off, no magazine extensions needed, and no cramped hand placement.

That full grip gives you control. It also gives the pistol its biggest carry drawback.

For concealed carry, grip length is usually harder to hide than slide length. The grip sticks away from the body. It prints under shirts. It pushes against cover garments when you bend, twist, sit, or reach.

That is why the Glock 45 MOS can feel great in the hand but still be more demanding to conceal than a Glock 19 or slimline Glock.

The capacity is a major strength. A standard 17-round magazine gives you 17+1 rounds of 9mm when carried chambered. For home defense, duty-style carry, and general defensive use, that is a serious advantage over smaller carry guns.

The size and capacity tell you exactly what the Glock 45 MOS is built for: control, speed, and capability over maximum concealment.

Optics Readiness and MOS Features

The biggest reason to choose the Glock 45 MOS over the standard Glock 45 is optics readiness.

The MOS slide allows you to mount compatible pistol red dots without sending the slide out for machining. That is a major convenience if you already know you want a dot or think you may want one later.

A red dot can make sense on the Glock 45 MOS because the pistol has enough size and grip to support serious shooting. Smaller guns can absolutely run optics, but a larger grip and 17-round capacity make the Glock 45 MOS feel more like a complete defensive platform.

The optic does not make you a better shooter by itself. It gives you a clearer aiming reference and more feedback. If your presentation is sloppy, you will lose the dot. If your grip is weak, the dot will bounce hard. If your trigger press is rough, the dot will tell on you.

That is a good thing if you train.

For defensive use, a red dot can help with target-focused shooting, distance, low-light sight confirmation, and accountability on harder shots. But it also adds responsibility. You need to manage batteries, mounting screws, lens cleaning, backup sights, and holster compatibility.

The Glock 45 MOS gives you flexibility. You can carry it with irons. You can add an optic later. You can build it into a home defense gun, duty-style gun, or concealed carry setup depending on your needs.

That flexibility is the main selling point.

How the Glock 45 MOS Shoots: Recoil, Accuracy, and Control

The Glock 45 MOS shoots well because it gives your hands enough pistol to work with.

The full-size grip is the advantage. You can build a strong two-handed grip, lock the support hand in place, and control recoil better than you usually can with smaller carry guns.

Compared to a Glock 43X, Glock 48, or Glock 26, the Glock 45 MOS feels easier to manage for fast strings. The larger grip gives you more leverage, and the added mass helps keep the gun settled. The recoil impulse is still normal 9mm Glock recoil, but the pistol is easier to drive.

Compared to a Glock 17, the Glock 45 MOS feels a little quicker because of the shorter slide. Some shooters like that. Others prefer the longer sight radius and slightly different balance of the Glock 17 or Glock 47.

Accuracy is not the problem with this pistol. Most misses with a Glock 45 MOS will come from the shooter, not the gun. The pistol has enough barrel, sight radius, grip, and mechanical capability for realistic defensive shooting and range work.

The trigger is typical Glock. It is usable, consistent, and predictable once you know it. It is not a custom 1911 trigger and does not need to be. For defensive use, consistency matters more than a glass-rod break.

Where the Glock 45 MOS really shines is practical control. Drawing from the holster, building a full firing grip, driving the sights or dot to the target, and shooting controlled pairs feels natural.

That is the reason people like this gun.

Is the Glock 45 MOS Good for Concealed Carry?

The Glock 45 MOS can work for concealed carry, but it is not the easiest Glock to conceal.

That is the honest answer.

The compact-length slide helps. A shorter slide can feel better when sitting, driving, or carrying appendix. It may dig less than a longer Glock 17-style slide depending on your body type and holster position.

But the full-size grip is the challenge. The grip is what prints. The Glock 45 MOS gives you a lot of grip above the beltline, and that grip can show under fitted shirts or light clothing.

For appendix carry, the Glock 45 MOS can work well with the right holster, belt, ride height, and concealment claw. The shorter slide can be comfortable, but the grip needs to be pulled into the body. If the holster lets the grip lean outward, it will print.

For strong-side IWB carry, the Glock 45 MOS can also work, especially under looser cover garments. A slight forward cant may help angle the grip with the body and reduce printing.

Where the Glock 45 MOS makes the most sense for concealed carry:

Cold weather carry

Jacket or hoodie carry

Larger body frames

Appendix carry with a concealment wing

Strong-side IWB with a proper cover garment

Carriers who prioritize shootability over minimum size

Where it struggles:

Thin summer clothing

Smaller-framed carriers

Deep concealment

Tucked-shirt carry

Any setup where grip printing is a major concern

If you want the easiest Glock to conceal, this is not it. If you want a very capable Glock that you can conceal with the right setup, the Glock 45 MOS is absolutely in the conversation.

Glock 45 MOS for Home Defense

The Glock 45 MOS is excellent for home defense.

The same features that make it harder to conceal make it easier to shoot. The full-size grip gives you control. The 17-round capacity gives you margin. The optic-ready slide gives you the option to run a red dot. The shorter slide still keeps the pistol handy around the house.

For home defense, concealment does not matter. Shootability, reliability, capacity, safe storage, and accessory setup matter more.

A Glock 45 MOS with a quality red dot can be a very practical home defense handgun. The dot gives a clear aiming reference, and the full grip makes the pistol easier to control under stress. If you choose to add a weapon light, make sure your holster and storage setup match that configuration.

Do not skip training. A home defense pistol is not just a thing you own. It is a tool you need to understand. Practice safe handling, reloads, malfunction clearance, low-light identification, and shooting under realistic pressure.

The Glock 45 MOS gives you the platform. Training makes it useful.

Glock 45 MOS for Range Use and Training

The Glock 45 MOS is also a strong range pistol.

It is large enough to shoot comfortably for longer sessions, but not so large that it feels like a dedicated competition gun. The 17-round magazines reduce reload frequency, and the full grip makes recoil control easier for newer and experienced shooters alike.

If you are learning red dot shooting, the Glock 45 MOS is a better training platform than many tiny optic-ready carry guns. Small pistols amplify mistakes. The Glock 45 MOS still gives you honest feedback, but it is easier to control while you build the presentation and track the dot.

It is also a good pistol for defensive classes. The capacity, grip size, and Glock magazine ecosystem all help. You can carry enough mags, run drills hard, and keep the gun fed without fighting a tiny frame all day.

For shooters who want one Glock that can train hard, defend the home, and still be carried with the right holster, the Glock 45 MOS makes a lot of sense.

Glock 45 MOS vs Glock 19 MOS

The Glock 19 MOS is the more concealable choice.

It has a shorter grip than the Glock 45 MOS, which makes it easier to hide under normal clothing. For many concealed carriers, that alone makes the Glock 19 MOS the better all-around carry gun.

The Glock 45 MOS gives you a full-size grip and 17-round standard capacity. That makes it easier to shoot for many people, especially those with larger hands. It also gives you more rounds in the gun without moving to extended magazines.

Choose the Glock 19 MOS if you want the better balance of concealability and capability.

Choose the Glock 45 MOS if you want better grip control, full-size capacity, and do not mind working harder to conceal it.

If you are deciding based strictly on concealed carry, the Glock 19 MOS usually wins. If you are deciding based on shooting performance and defensive capability, the Glock 45 MOS has a strong argument.

CYA supports the compact platform with options like the Glock 19 holster, while Glock 45 carriers can start with the dedicated Glock 45 holster collection.

Glock 45 MOS vs Glock 17 MOS

The Glock 17 MOS is the traditional full-size option.

It gives you a longer slide and barrel than the Glock 45 MOS, while keeping a full-size grip and 17-round standard magazine capacity. That longer slide can give a longer sight radius with iron sights and a slightly different recoil feel.

The Glock 45 MOS keeps the full grip but shortens the slide. That makes it feel faster out of the holster and sometimes more comfortable for carry.

For home defense and range use, both are excellent. The Glock 17 MOS may appeal to shooters who like a classic full-size pistol feel. The Glock 45 MOS may appeal to shooters who want a full grip with a more compact slide.

For concealed carry, the Glock 45 MOS usually has the edge over the Glock 17 MOS because the shorter slide can be easier to manage. But neither pistol hides as easily as a Glock 19 or slimline Glock.

Choose the Glock 17 MOS if you want a full-size Glock in the traditional format.

Choose the Glock 45 MOS if you want the full-size grip with a shorter, more carry-friendly slide.

Glock 45 MOS vs Glock 47 MOS

The Glock 47 MOS is another full-size Glock option, and it adds modularity to the conversation.

The Glock 47 uses a full-size frame and full-length slide, but it is designed with compatibility across certain Gen 5 Glock models in mind. For users who own multiple Glock pistols, that modularity can be appealing.

The Glock 45 MOS still has the shorter slide. It is a little more compact in the slide while keeping the same full-size grip concept.

In practical terms, the Glock 47 MOS leans more toward full-size duty, range, and home defense use. The Glock 45 MOS leans more toward crossover use, where the shooter wants full-size control but does not want the longer slide.

If you are going to carry concealed, the Glock 45 MOS may be easier to live with. If you want a more traditional full-size MOS Glock with modular benefits, the Glock 47 MOS deserves a look.

Glock 45 MOS vs Glock 19X

The Glock 19X and Glock 45 are close relatives in concept. Both use the compact slide and full-size grip idea.

The Glock 19X has its own military-trial background, coyote color, and some model-specific differences. The Glock 45 MOS gives you the Gen 5-style black crossover format with MOS optic readiness.

For most modern buyers who want a red dot-ready crossover Glock, the Glock 45 MOS is the more practical pick. The MOS system is the deciding factor if optics matter to you.

If you love the 19X look and do not care about factory optic readiness, the 19X still has appeal. But for a carry or defensive pistol you may want to modernize, the Glock 45 MOS is easier to justify.

Glock 45 MOS vs Glock 43X

The Glock 43X is much easier to conceal.

It is slimmer, lighter, and has a shorter overall feel inside the waistband. For everyday concealed carry under normal clothing, the Glock 43X is more forgiving.

The Glock 45 MOS is easier to shoot, has more capacity, and handles recoil better for most people. It is also better suited for home defense and duty-style use.

This comparison comes down to priorities.

Choose the Glock 43X if concealed carry comfort and low printing matter most.

Choose the Glock 45 MOS if you want more gun in your hand, more capacity, and better control.

A lot of carriers eventually own both types: a larger Glock for home defense or serious training, and a slimline Glock for easier daily carry. If you go slim, CYA offers support through the Glock 43X holster collection.

Glock 45 MOS Holster Considerations for Daily Carry

A Glock 45 MOS needs a serious holster.

This is not a tiny pocket pistol where you can get away with a loose, generic setup. The Glock 45 MOS has a full-size grip, real capacity, and optic-ready capability. The holster has to manage all of that.

For concealed carry, look for:

Full trigger guard coverage

Secure retention

Stable belt attachment

Optic-compatible clearance if running a red dot

Adjustable ride height or cant when possible

A concealment claw or wing for appendix carry

Comfortable edges for daily wear

Proper fit for your exact Glock 45 MOS setup

The grip is the biggest concealment issue, so the holster needs to help control it. A concealment wing can rotate the grip inward toward the body. Ride height can affect both access and printing. Cant can help with strong-side IWB carry.

If you are running a red dot, make sure the holster is cut for optic clearance. If you are running suppressor-height sights, a threaded barrel, or a compensator, check compatibility before trusting the holster for daily use.

CYA’s Glock 45 holsters are built for concealed carry users who need secure retention, daily comfort, and model-specific fit. For modern Glock 45 setups, the Glock 45 RIDGE IWB holster is designed around features many carriers want, including optics compatibility, suppressor-sight compatibility, compensator compatibility, threaded-barrel compatibility, a DCC Monoblock, and a ModWing concealment claw.

That is the kind of setup that makes a larger carry pistol more realistic.

You can also browse the broader CYA Glock holster collection if you are comparing multiple Glock models before committing.

Who Should Choose the Glock 45 MOS?

The Glock 45 MOS is a strong choice for shooters who want more control than a compact pistol without going all the way into a long-slide full-size setup.

Choose the Glock 45 MOS if you:

Want an optic-ready defensive pistol

Prefer a full-size grip

Want 17-round standard capacity

Use a pistol for home defense and carry

Shoot better with larger grips

Want a crossover Glock with a compact slide

Train regularly from the holster

Can conceal a full-size grip with your wardrobe and holster setup

The Glock 45 MOS makes sense for the shooter who values performance over minimum size.

It is especially good if you want one pistol for multiple roles. It can sit in a home defense setup, run hard at the range, carry in a duty-style role, and still conceal under the right conditions.

That flexibility is the point.

Who Should Not Choose the Glock 45 MOS?

The Glock 45 MOS is not ideal for everyone.

You may be better served by another Glock if you:

Need deep concealment

Have a smaller frame

Wear fitted or light clothing

Carry appendix and struggle with grip printing

Want the smallest possible daily carry gun

Do not plan to use an optic

Prefer compact grip dimensions

Want a lighter pistol for all-day carry

For pure concealed carry, the Glock 19 is often easier to hide. For slim carry, the Glock 43X or Glock 48 may be more comfortable. For full-size range and home defense use, the Glock 17 or Glock 47 may make more sense.

The Glock 45 MOS is a great pistol, but it is not magic. The full-size grip still has to go somewhere.

Final Verdict: Is the Glock 45 MOS Worth Buying?

The Glock 45 MOS is worth buying if you want an optic-ready 9mm Glock that gives you full-size control with a compact-length slide.

It is reliable, shootable, easy to train with, and flexible enough for home defense, duty-style use, range work, and concealed carry with the right setup. The 17-round capacity and full-size grip make it easier to run than smaller carry guns, especially under speed.

The downside is concealment. The Glock 45 MOS is not hard to carry because of the slide. It is hard to hide because of the grip. If you can manage that grip, the pistol gives you a lot in return.

Choose the Glock 45 MOS if you want a modern defensive Glock with red dot capability and strong practical performance.

Choose something smaller if concealment is your top priority.

Once you make the decision, do not treat the holster as an afterthought. A pistol this capable deserves a holster that actually supports daily carry.

If you are carrying the Glock 45 MOS, start with a dedicated Glock 45 holster built for secure retention, full trigger guard coverage, optic-compatible fit where applicable, and practical comfort. You can also compare options across the full CYA Glock holster collection to build a carry setup that fits your pistol, body, and daily routine.

CYA builds American-made holsters for real concealed carry use. If the Glock 45 MOS is going on your belt, carry it in a holster that keeps it secure, protected, comfortable, and ready.

FAQ: Glock 45 MOS

Is the Glock 45 MOS good for concealed carry?

Yes, the Glock 45 MOS can work for concealed carry, but it is easier to conceal with the right holster and clothing. The compact slide helps comfort, but the full-size grip can print more than a Glock 19, Glock 43X, or Glock 48.

What is the Glock 45 MOS best used for?

The Glock 45 MOS is best for home defense, range training, duty-style carry, red dot use, and concealed carry setups where the user can manage a full-size grip. It is a strong multi-role defensive pistol.

What is the difference between the Glock 45 MOS and Glock 45?

The Glock 45 MOS has Glock’s Modular Optic System, which allows compatible red dot optics to be mounted to the slide. The standard Glock 45 does not have the same factory MOS optic cut.

Is the Glock 45 MOS better than the Glock 19 MOS?

The Glock 45 MOS is easier to control and has a full-size 17-round grip. The Glock 19 MOS is easier to conceal because it has a shorter grip. Choose the Glock 45 MOS for shootability and capacity. Choose the Glock 19 MOS for better concealment.

Is the Glock 45 MOS better than the Glock 17 MOS?

The Glock 45 MOS has a shorter slide than the Glock 17 MOS, which can make it easier to carry and quicker out of the holster. The Glock 17 MOS has a longer slide and more traditional full-size balance. Both are strong defensive pistols.

Does the Glock 45 MOS hold 17 rounds?

Yes. The Glock 45 MOS uses standard 17-round Glock 9mm magazines. It can also accept compatible larger Glock double-stack 9mm magazines.

Is the Glock 45 MOS too big for appendix carry?

Not necessarily, but it depends on your body type, holster, belt, and clothing. The full-size grip is the hardest part to conceal. A quality appendix holster with a concealment wing can help reduce printing.

What holster works best for the Glock 45 MOS?

A dedicated Glock 45 holster with secure retention, full trigger guard coverage, and optic-compatible clearance is best for the Glock 45 MOS. If you carry appendix, a concealment claw or wing can help pull the grip inward.

Is the Glock 45 MOS worth it if I do not use a red dot?

It can still be worth it, especially if you may want a red dot later. If you are certain you will never use an optic, the standard Glock 45 may be enough. The MOS version gives you more flexibility.