GLOCK Pistol – Mod. 21 Gen5 MOS FS – .45 Auto

The .45 Powerhouse | Gen5 Refinement | MOS Optics Ready | 13+1 Rounds | GLOCK 21 Gen 5 MOS FS

Overview – The Timeless .45 Auto, Perfected

The GLOCK 21 Gen5 MOS FS brings the legendary stopping power of the .45 Auto cartridge into GLOCK’s most advanced generation yet. Introduced in 1990, the original 21 glock quickly became the nation’s most popular police .45 Auto pistol, and for good reason – it combined the firepower of the classic round with GLOCK’s revolutionary polymer-frame reliability . Now, the glock 21 gen 5 elevates this platform with every refinement GLOCK has developed over four decades.

For this reason, whether you need a personal defense weapon for home protection, a reliable handgun for duty use, or a powerful pistol for hunting backup, the GLOCK 21 Gen 5 MOS FS delivers the unmistakable authority of the .45 Auto with modern optics capability.

The MOS (Modular Optic System) configuration allows for simplified mounting of popular red dot sights. Meanwhile, the Front Serrations (FS) provide an additional tactile surface for slide manipulations. Consequently, when you pistole kaufen this glock g 21 from sportwaffenshop.com, you receive a powerful, accurate, and optics-ready handgun that honors the .45 Auto’s timeless legacy.

Fact: The .45 Auto cartridge has been regarded with special reverence by shooters for over a century. Many shooters feel a unique relationship with this timeless caliber, and the GLOCK 21 Gen5 presents everything one would expect of a .45 Auto pistol – remarkable accuracy, light recoil for its power level, and high magazine capacity .

And for those who remember the classic German tradition: while “Glocken läuten heute 21 Uhr” (bells ring tonight at 9 PM) is a cultural reference, the GLOCK 21 is ready to answer the call at any hour.

Technical Specifications

Key Features – The .45 Auto, Perfected for Gen5

The .45 Auto Caliber – Timeless Stopping Power

The .45 Auto has long been regarded with a special reverence among shooters .

First, the cartridge delivers proven stopping power – a 230-grain bullet traveling at approximately 850 fps creates a substantial wound channel.

Second, despite its power, the GLOCK 21 is known for light recoil. The durable polymer frame absorbs much of the impulse, and the .45 Auto has rightfully earned the reputation of a “well-mannered large caliber” .

Third, the 13+1 round capacity is exceptional for a .45 Auto pistol. Traditional 1911 pistols typically hold only 8 rounds .

For shooters who own a glock 17 gen5 in 9mm or a glock 19 for concealed carry, the glock 21 offers a powerful complement – the same GLOCK reliability in the classic .45 Auto caliber.

GLOCK Marksman Barrel (GMB) – Enhanced Accuracy

The GLOCK Marksman Barrel is standard on the glock 21 gen 5, and it delivers impressive precision.

First, the barrel features enhanced rifling based on the proven polygonal barrel design. Therefore, it delivers improved accuracy compared to previous generations .

Second, independent testing has produced impressive results. In one test, Winchester Ranger-T 230-grain ammunition produced a 0.25-inch center-to-center group for the best three shots – a level of accuracy rarely seen in a duty pistol .

Third, the cold hammer-forging process ensures consistency and durability. The barrel is built to last for tens of thousands of rounds.

During testing, the G21 produced 5-shot groups averaging just 39mm (1.5 inches) at 25 meters – exceptional accuracy for a .45 Auto duty pistol .

Modular Optic System (MOS) – Optics Ready

The MOS configuration is a significant upgrade for the glock g 21.

First, the slide is precision machined with a mounting system for popular optic sights. Therefore, you can mount miniature red dot sights without aftermarket milling.

Second, the system includes adapter plates for various footprints. The pistol can accept Trijicon RMR, Holosun 407C/507C, Leupold DeltaPoint Pro, and other popular optics .

Third, the MOS system is factory-engineered. Consequently, the optic sits at the correct height and maintains zero under recoil.

During testing, the G21 Gen5 MOS was easily equipped with a Trijicon RMR, making extended range sessions far more comfortable and resulting in very tight shot groups .

Front Serrations (FS) – Enhanced Slide Manipulation

The Front Serrations provide a distinct practical advantage, especially with a mounted optic.

First, they offer an additional gripping surface at the front of the slide. Therefore, press checks, malfunction clearances, and slide manipulations are easier and more secure .

Second, the serrations are particularly useful when you have a mounted optic. Consequently, you have a grippy surface that is not blocked by the red dot sight.

Third, the front serrations complement the existing rear cocking serrations for a complete manipulation package.

nDLC Finish – Extreme Durability

The nDLC (non-Diamond Like Carbon) finish is GLOCK’s most advanced surface treatment .

To start, it is tougher and more durable than previously used finishes. Therefore, protection against rust and scratches is significantly improved.

Additionally, the finish has self-lubricating properties to some degree. Consequently, the pistol functions reliably even with minimal lubrication.

Above all, the nDLC finish helps the pistol work in adverse conditions – from freezing cold to desert heat, from rain to sweat.

Gen5 Frame – No Finger Grooves, Flared Magwell

The glock 21 gen 5 frame incorporates several shooter-driven improvements.

To begin with, the finger grooves have been removed. This was one of the biggest “fit” complaints of the original G21 – the grooves simply didn’t fit all finger sizes. Now, the comfortable flat front-strap fits a wider range of hand sizes .

Second, the flared magwell makes reloading faster. The opening measures approximately 1.20 inches across – considerably wider than previous generations – and the beveled design funnels the magazine into the grip .

Third, the Gen4-proven RTF (Rough Textured Frame) surface provides excellent grip traction without being too aggressive .

Fourth, the reversible magazine catch is enlarged and can be switched for left-handed shooters .

Fifth, the ambidextrous slide stop lever makes manipulation easy for both right and left-handed operators .

Modular Beavertail Backstrap System (MBS)

The Gen5 frame includes GLOCK’s Modular Beavertail Backstrap System .

First, the system includes multiple backstraps in different sizes. Therefore, you can customize the grip circumference to fit your hand size perfectly.

Second, the beavertail design prevents slide bite and promotes a high, consistent grip.

Third, the backstraps are quickly and easily interchangeable without special tools.

Enlarged Magazine Floor Plate

The enlarged floor plate is a thoughtful Gen5 addition.

First, the enlarged front of the floor plate makes it easier to pull the magazine free of the pistol if it doesn’t fall freely during a malfunction or reload .

Second, the orange follower allows the shooter to clearly see if there are any rounds left in the magazine .

What’s Included

GLOCK 21 Gen5 MOS FS vs. Other GLOCK Models

Verdict: The GLOCK 21 Gen5 MOS FS is the ultimate .45 Auto duty pistol. It offers the proven stopping power of the classic caliber with modern Gen5 refinements, MOS optics readiness, and exceptional accuracy. For shooters who prefer the .45 Auto over 9mm, the G21 is unmatched.

For shooters who own a glock 19 for concealed carry or a glock 17 gen5 for competition, the glock 21 serves as a powerful home defense and hunting backup companion.

Who Is This Pistol For?

For Home Defense / Personal Defense Weapon

The .45 Auto is a legendary defensive caliber. With 13+1 rounds of proven stopping power, a Picatinny rail for lights or lasers, and GLOCK’s legendary reliability, the G21 Gen5 MOS FS is an outstanding personal defense weapon.

Store it alongside your benelli m4 shotgun or remington 700 rifle – the G21 covers your handgun needs with authority.

For Hunters as Backup

The .45 Auto is adequate for finishing shots on wounded game. The G21 offers 13+1 rounds – significantly more than a traditional colt python or harrington and richardson revolver. The MOS system allows for a red dot for fast target acquisition in low light.

For hunters who carry a remington 700 bolt action rifle, the G21 is the ideal backup sidearm.

For .45 Auto Enthusiasts

If you appreciate the timeless .45 Auto cartridge, the GLOCK 21 Gen5 MOS FS is the most advanced .45 Auto pistol GLOCK has ever produced. The Gen5 refinements – no finger grooves, flared magwell, Marksman barrel, nDLC finish, and MOS optics – make this the best G21 yet.

For shooters who also own a colt python, 1911, or other classic .45s, the G21 offers a modern polymer-framed alternative.

For Duty / Law Enforcement

The original 21 glock became the nation’s most popular police .45 Auto . The Gen5 MOS FS continues this legacy with modern optics capability and ergonomic refinements. The .45 Auto’s proven terminal performance makes it a trusted duty round.

Pair it with a benelli m4 shotgun for a complete duty setup.

For Collectors

The glock 21 gen 5 is a significant release – the .45 Auto caliber brought into GLOCK’s most advanced generation. As the Gen5 lineup continues to expand, the G21 is an important addition to any GLOCK collection.

Add it to your collection alongside a glock 17 gen5, glock 19, glock 43x, glock 45, and glock 49 for a comprehensive GLOCK collection spanning calibers and configurations.

For Suppressor Enthusiasts

The GLOCK 21 is an excellent candidate for a suppressed pistol. With the addition of a threaded barrel (available separately) and a schalldämpfer, the G21 becomes a quiet, powerful host. The factory MOS system allows for a red dot to clear the suppressor height .

Accuracy & Performance – Test Results

The GLOCK 21 Gen5 MOS FS has been extensively tested by firearms publications.

All4Shooters testing (25 meters, seated rest): The G21 produced 5-shot groups averaging just 39mm (1.5 inches). The differences between various ammunition types were minimal, demonstrating exceptional barrel consistency .

GUNS Magazine testing (25 yards):

• Remington 185-grain JHP: 1.65-inch group (best three: 0.80 inches)

• Winchester Ranger-T 230-grain: 2.50-inch group (best three: 0.25 inches!) 

Reliability testing (over 6 months, 750 rounds): One tester reported 100% reliability – zero malfunctions across all ammunition types and weather conditions .

Trigger feel: The Gen5 trigger is a significant improvement over previous generations. There is firm resistance from the beginning of the pull, then a smooth roll to the shot. Many consider it GLOCK’s best “street trigger” yet .

Recoil: The G21 has always “kicked light for its power level,” and the Gen5 is no exception. Even smaller-framed shooters find it easily controllable .

MOS Adapter Plate Compatibility

The MOS system includes adapter plates for the following optic footprints:

Note: The specific adapter plates included may vary by region and production date.

Ammunition Recommendations

The GLOCK 21 Gen5 MOS FS performs reliably with all SAAMI-spec .45 Auto ammunition.

For practice: .45 Auto FMJ from S&B, Geco, Magtech, Fiocchi, or Federal. The GMB barrel handles all standard pressure loads without issue.

For defense: Premium hollow points such as Speer Gold Dot 230gr, Hornady Critical Duty 220gr, or Federal HST 230gr.

For hunting / backup: Hard-cast lead or bonded JHP loads for deep penetration.

Accuracy note: The Marksman barrel seems well-optimized for 230-grain loads, which produced the tightest groups during testing .

Holster Compatibility

The GLOCK 21 Gen5 MOS FS fits holsters designed for the GLOCK 21/20 frame size (the large-frame GLOCKs). Note that the slide is approximately 2.5mm wider than a G17 slide .

Inside-the-waistband (IWB): For concealed carry – though the G21 is a large pistol, many shooters conceal it with the right holster and clothing.

Outside-the-waistband (OWB): For range use, open carry, or duty use – the most common carry method for the G21.

Duty holsters: For law enforcement or security work – these typically include retention mechanisms.

Chest holsters: For hunters or outdoor activities – keeps the pistol accessible while wearing a backpack.

Many glock merchandise options, including glock gun cases and holsters, are available at sportwaffenshop.com – your glockshop for all things GLOCK.

How to Buy – Transactional Process

To begin, browse sportwaffenshop.com. Then add this GLOCK 21 Gen5 MOS FS to your cart.

Next, upload your valid WBK (German Weapons Ownership Card). We accept documents via our gun apps to buy guns for iOS and Android.

After that, we verify your documents. Then we process your waffe kaufen transaction within 48 hours.

Finally, we ship to your chosen waffenladen (e.g., Triebel Berlin). Alternatively, we can ship to any licensed firearms dealer in Germany or across Europe.

Note: This pistole requires a WBK slot. All sales are final once WBK is registered – this is conventional firearms retail.

Why Choose sportwaffenshop.com?

First and foremost, we are GLOCK specialists. We stock glock 21, glock 21 gen 5, glock 17 gen5, glock 19, glock 43x, glock 45, glock 49, 45 cal glock, and the P80 Limited Edition.

In addition, we carry SIG-SAUER pistols, benelli m4 shotguns, remington 700 rifles, and a full range of ammunition.

Moreover, we are transactional. We offer fast WBK processing and quick shipping to your local waffenladen.

Finally, we are app-enabled. Our gun apps to buy guns make WBK upload simple.

Above all, we are a licensed shop for weapons – not a marketplace.

Ready to Buy the GLOCK 21 Gen5 MOS FS?

Add this pistole to your cart today at sportwaffenshop.com. You will receive the most advanced .45 Auto pistol GLOCK has ever produced – with MOS optics, front serrations, GLOCK Marksman Barrel, nDLC finish, and 13+1 rounds of proven stopping power.

Whether you keep it for home defense as a personal defense weapon, carry it for duty, or add it to a collection featuring glock 17 gen5, glock 19, glock 43x, and glock 45, the GLOCK 21 Gen5 MOS FS delivers GLOCK’s legendary reliability in the powerful .45 Auto caliber.

And when the bells ring – whether at 9 PM or any other hour – the glock g 21 is ready to answer.

Pistole kaufen. Waffe kaufen. Legal. Fast. Conventional.

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