9mm ar15 conversion

9mm ar15 conversion DEFAULT

Changes in the popularity of various ballistics types have been constant over the years. The modularity of guns like the AR-15 makes it possible to convert the rifle to a different caliber a rather simple process.

Let’s have a look at how to go through the process and make some recommendations about the best kits available to help you through it.

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Advantages of a 9mm AR-15

When you switch to 9mm you get to enjoy a few factors.

One is the lower the cost of ammunition. Obviously you’re going to put this to a different use, but shooting 9mm is going to save you a bit per shot.

The muzzle blast and noise is another factor. The smaller caliber is going to lessen the noise and maybe make it just a little more comfortable to shoot.

Compared to shooting with a pistol, you gain a bit of range and speed when shooting with an AR. There are of course other, more powerful options for shooting a 9mm, but if you like the AR platform it’s a decent choice.

Finally, if you find it practical to stock up on one type of ammo, choosing 9mm might serve you well. The cost and versatility make it a good choice when you want to have a good supply on hand for various uses in case of SHTF scenarios.

Comparison Chart of the Best 9mm Conversion Kits for the AR-15

What to Watch For When Buying a 9mm Conversion Kit

Converting an AR-15 to a pistol caliber might sound daunting. However, 9mm conversion kits help to make it a streamlined and straightforward process. Some gunsmithing experience is useful, but even a novice or beginner shouldn’t have much of a problem completing the process. Choosing the best 9mm conversion kit is the best place to start. The following information will help you learn what to look for when shopping.

This Section Written By: Brian Belko

Expert Author

Why Would I Do This?

That question might run through your head when you consider the possibility of converting your existing AR-15. It’s a fair question to be sure. You already have a perfectly fine AR-15 chambered in your favorite rifle caliber. What’s the point? Why not just buy a separate pistol caliber carbine? Well, there are several reasons a conversion is ideal.

One of the main reasons is that you will be able to avoid a lot of the waiting time, fees, and hassle of buying a complete firearm. Another big reason is that you will be able to use your existing lower, and any upgrades you have made to it such as a nice trigger, instead of starting fresh.

Just in case you need a few more reasons, converting your AR-15 to 9mm reduces the cost and fatigue of high-volume shooting during training or range days, makes it an excellent home defense option, and allows you to pair it with your favorite handgun and even share magazines between them.

What Are My Options?

Converting an AR-15 to fire 9mm rounds can be accomplished in several ways depending on your preference. Replacing the existing bolt carrier group (BCG) with a 9mm BCG and replacing the entire upper with a complete 9mm upper is one option. This will allow you to use your existing lower.

Another option is to convert the existing upper to work with 9mm. This method is a little more involved as it requires replacing parts such as the barrel instead of just dropping in a new upper. Consider your skill level and how involved you want to get when deciding on a 9mm conversion kit.

Magazine Compatibility

One of the best parts of pairing your converted AR-15 with a pistol of the same caliber is that you will be able to share magazines between them. This is not only a time-saver when taking both guns to the range, but it is also an advantage in a home defense setup. Not all 9mm conversion kits accept the same magazines so pay attention to that when shopping. The most common magazine styles in conversion kits are Colt-style, Uzi-style, and Glock-style.

Review of the Best 9mm Conversion Kits for the AR-15

Below, we’ve created this brief guide to enable you to make an easier decision would you use a mag well block that converts your conventional AR-15 lower to accept either Colt or Glock magazines.

How Tough Is This Conversion?

Being a king of modularity, the AR-15 deserves the nickname the Lego of the firearm world. Any owner knows how easy it is to make adjustments to the gun and add a limitless array of customizations.

Gun owners can choose from several options for converting a mil-spec AR-15 to 9mm. The easiest way is to swap the upper assembly for another completed upper receiver.

You could also just use a conversion kit that replaces the bolt carrier group.

The first and more expansive approach implies a straightforward drop-in to fit your Lower Receiver. This package usually consists of an upper assembly including a barrel and a magazine well adapter. It can cost from $700 to well above 1,000 dollars.

The other method means using the AR’s standard upper receivers. You can then convert to 9mm Parabellum caliber by fitting a new barrel, new bolt, and a magazine adapter.

Tools Needed

Building a 9mm upper receiver with a conversion kit is a very simple operation if you’re comfortable with a few basic tools. To replace the bolt carrier group and buffer and insert the block into the magazine well you’ll need a barrel nut wrench such as this tool from TAPCO. You’ll also need a receiver vise block like the ProMag AR-15/M16 Upper And Lower Receiver Magazine Well Vise Block set.

Parts To Be Changed

Using a conversion kit does work out to be more affordable, usually, than buying the pieces individually. Separate piece prices fall around $200 for a bolt; the 9mm barrel will set you back another $150-$200; the magazine block $50-$200 and the heavy buffer and heavier buffer spring, $50-$75.

Unlike the AR-15’s regular 20″ barrel, the pistol-caliber carbine usually features a 16″ barrel or shorter. They may have straight magazines with a 10 or 32 round capacity. There are also 50 and 100 round drum magazines. However, ownership of magazines with more than 10 rounds and a barrels length of less than 16″ is illegal and it is subject to penalties in California, New York, New Jersey, Connecticut, Massachusetts, Colorado and Washington DC.

How to Make the Conversion

The installation of the 9mm barrel is the same as any other barrel and can be done without gunsmithing or other modifications. Since the back of the barrel is the same diameter and shape, and the barrel nut is the same, just torque the barrel nut and finish with the handguard of your choice. Just keep in mind that the 9mm barrel has different threads at the muzzle than the .223/5.56 to prevent you from installing an inadequate flash hider on your 9mm barrel.

The massive one-piece bolt is a blowback type and replaces the standard two-piece .223/5.56mm bolt. While it uses the same charging handle and buffer, for the best performance you should install the heaviest buffer.

Another modification made to the rifle would be using a special adapter to allow the use of smaller 9mm magazines. There are two types of conversion blocks: one inserted from beneath and held in position by the mag catch and the other from the top, held in by some bulge and lips. It is recommended to use the conversion adapter drop in from the top.

The barrel lengths ranging from 16 inches for carbine conversions to pistol barrels that are just 3″ long!

Can the 9mm Mod Easily Be Converted Back?

Yes, of course. Changing the 9mm mod is as easy as mounting one. All you have to do is to pull out the mod from the mag well, take out the two takedown pins, change the upper, put back the pins, and you’re good to go. The 9mm mods were designed to save you time and money. It prevents you from having to buy a completely new AR-15 chamber for the 9mm.

The mods here are so simple that you’ll never need a gunsmith. If you know how to separate the upper and lower receiver, you can apply and remove the mod within seconds. However, if you don’t know how it works, it takes only a couple of minutes to learn.

The 9mm mods are just plug-and-play devices. You can shoot a 9mm from a 223 platform without changing the upper receiver, however, it is still not recommended. So most of the time spent in changing the mod is changing the upper receiver fit for the 9mm caliber, which amounts to approximately 30 seconds.


For the civilian market, being able to use 9mm ammo in both a handgun and a rifle makes sense in a lot of scenarios. Pistol-caliber carbines are good as home-defense rifles. They’re also great as plinking guns and training rifles for adults as well for youngsters. If you’re ready to make the switch, it’s not a hard adjustment – give it a try!

Josh Lewis

Josh Lewis the managing editor at Gun Mann and when he isn't writing about guns he is more than likely tinkering with them. He also enjoys hunting, fishing and spending time outdoors. As a lifelong gun owner he knows his stuff!

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Sours: https://www.gunmann.com/ar-15-9mm-conversion-kits/

Related Products

Kit includes AR-15 9mm Conversion Adapter, 7" Keymod Rail 9mm Complete Upper, Buffer Tube for 9mm Carbine and 10 Round Glock Style Magazine.


100% Made in the USA in Summerville, SC by American Tactical!

IMPORTANT! - You must install a complete 9MM AR Rifle or Pistol Upper receiver onto your 556/223/300blk Lower Receiver for this to fit and operate.  See further details at the bottom of this page.

New from American Tactical, the AR-15 conversion adapter that will fit any standard AR-15 556/223 lower and convert it to 9mm with no required modifications to your lower or magazines!


Made from 6061-T6 Aluminum, this durable mag well adapter has a built in magazine release for your Glock mags, locks in place with your standard AR-15 magazine catch, releases the same way AR mags do and has a bolt hold open feature that locks your bolt back after the last round.


This 9mm AR adapter accepts Glock style double stacked 9mm magazines and comes with one 31 round magazine.


Plug and play and convert your lower to 9mm affordably today!


IMPORTANT - It is recommended that you use a 9mm heavy buffer.  Standard AR-15 buffers may be too light to operate the 9mm upper system without malfunction.(Included in kit)


Limited Lifetime Warranty and Product Return Policy Please Click Link For Further Details:

Please Read and Review Parts Disclaimer:

IMPORTANT! - You must install a complete 9MM AR Rifle or Pistol upper receiver onto your 556/223/300blk lower receiver for this to fit and operate.  Attempting to install your 9mm Adapter in a firearm without a 9mm upper receiver installed may damage the adapter or your firearm.  Damage cause by imporoper use will void the Limited Lifetime Warranty.  Attempting to fire 9mm ammunition through an upper receiver that is not a 9mm upper receiver may result in injury.  

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Sours: https://www.americantactical.us/5873/detail.html
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Convert your standard mil spec AR 15, M4, M16 lower assembly to use 9mm and .40 S&W Glock Magazines!  The Mag-AD series adapters install in seconds.  Boasting a last round hold open feature making them a breakthrough product and a must-have for law enforcement and civilian gun enthusiasts alike.

The Stern Mag-AD9 series adapters are made of aircraft grade aluminum, lightweight with ergonomic design.   

Note: These adapters require the use of a 9mm or 40S&W barrel, "depending on chosen caliber" and a Glock cut bolt.


Looking for a complete conversion kit?  We have you covered.
Click Here.

Already have a Colt Style bolt and want to use our system?  We have you covered.
Click Here

Don't Have a bolt, want one?  We have you covered.
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Don't Have a barrel, want one?  We have you covered.
Click Here


Technical Information:

⦁    Made in the U.S.A.

⦁    Constructed from 6061 T6 aircraft grade aluminum.

⦁    4140 NiB coated feed ramp.

⦁    Hard coat anodized type 3.

⦁    Sturdy Construction.

⦁    Ergonomic mag release.

⦁    Works with all generations of Glock magazines.

⦁    Works with any mil spec ar15 lower receiver.

⦁     All gun components besides the Bolt and Barrel remain stock

Please visit the following link before purchasing to ensure compatibility with your setup.






Sours: https://getstern.com/mag-ad9/

Best AR-15 9mm Conversion Kits

The AR-15 is the most popular rifle pattern in the United States that hundreds of companies manufacture, either in whole or in part. While the standard caliber .223 Remington/5.56mm is accurate, powerful, and light recoiling, many gun owners select pistol-caliber variants or convert existing rifles to handgun cartridges, such as 9mm Luger, .40 S&W, and .45 ACP. There are multiple reasons for this, from reducing training costs to pairing your rifle with your sidearm.

Best AR-15 9mm Conversion Kits

Converting a .223/5.56mm AR-15-pattern rifle to 9mm requires either a dedicated upper receiver — complete with 9mm barrel, bolt carrier group and buffer spring assembly — or the installation of these individual parts into an existing upper.

The standard AR-15 rifle uses a direct-impingement gas system and a bolt-carrier group to match. In 9mm, as with many semi-automatic pistol-caliber carbines and submachine guns, the operating system is simple blowback.

Assuming you already have the 9mm upper receiver or the necessary component parts, you must install an adapter to continue using your existing lower receiver with 9mm handgun magazines.

1. Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group Complete

faxon firearms gen 2 9mm pcc bolt carrier group complete

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If you’re interested in altering your existing upper receiver to accommodate a different caliber, one of the first groups or assemblies you must change after the barrel is the bolt carrier group. A .223/5.56mm BCG uses a rotating bolt with 7 radial locking lugs that engage corresponding recesses in the barrel extension. A direct-impingement or short-stroke gas-piston system actuates it.

However, most 9mm pistol-caliber carbines and submachine guns use a blowback system, where the mass of the bolt and the tension of the recoil spring oppose the breech’s opening. Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group is one of the simplest purchases toward converting your rifle to a pistol caliber.

Faxon machines this bolt carrier group from 8620 alloy steel, and it’s on the heavy side, coming in at 14.9 oz.

Its use as a blowback alternative can still accommodate a traditional AR-15/M16 extractor and dust cover. The ramped bottom is also compatible with standard mil-spec fire-control groups.

2. Foxtrot Mike Products PA Exclusive FM9 3 Gun 9mm Complete Upper

foxtrot mike products pa exclusive fm9 3 gun 9mm complete upper

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If you’d rather replace the upper receiver entirely, Foxtrot Mike Products offers you that option. The FM9 3 Gun 9mm Complete Upper features a 16” 9mm barrel with a 1:10” rifling twist rate housed in a 15” M-LOK handguard. This twist rate stabilizes a wide variety of 9mm bullet weights.

Foxtrot uses a proprietary locking system to ensure the monolithic upper receiver and handguard remain firmly attached at all times. If you’re left-handed, you can appreciate the ambidextrous charging handle, which features oversized latches, so you’ll never have difficulty loading or unloading the weapon.

Although the 9mm cartridge produces soft recoil, the muzzle has a Primary Weapons Systems compensator to reduce muzzle climb from rapid-fire shooting sessions. This is perfect for fast-paced competition where speed and accuracy need to be balanced.

Because this is a complete upper, it also includes a 9mm bolt carrier group designed for blowback operation.

3. Stern Defense AR-15 Conversion Block

stern defense ar-15 conversion block

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Once you have a suitable upper receiver, look for conversion blocks or adapters that enable you to use your existing lower receiver. The magazine well for a USGI 5.56mm magazine is considerably longer than that of a double-column 9mm pistol or submachine gun magazine. You can use 9mm or .40 Smith & Wesson handgun magazines, such as those of the popular Glock series, by installing a conversion block.

Stern Defense’s Magazine Conversion Block is easy to install — requiring no special tools — and can lock the bolt open when the last round is fired, allowing for rapid reloads using the bolt catch.

The company manufactures its magazine adapter using 6061-T6 aluminum alloy to reduce weight, but the feed ramp is NiB 4140 alloy steel. This conversion block is compatible with bolts cut for Glock magazines.

4. Hahn Precision Conversion Block

hahn precision conversion block

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For use with Colt and UZI 9mm magazines, as opposed to those used with Glock firearms, this conversion block lets you convert your AR-15 to a pistol-caliber carbine akin to that of a submachine gun.

Hahn uses the standard AR-15/M16 bolt catch because of its superior durability. Installation is simple and requires removing the existing bolt catch, insertion of the adapter, and re-installation of the bolt catch. This conversion block also features a bolt hold-open function, so when you fire the last round, the bolt locks open.

The company machines the block from an aluminum billet, so it’s highly durable.

5. Angstadt Arms AR-15 9mm Barrel

angstadt arms ar-15 9mm barrel

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One of the essential parts of a caliber conversion is the barrel. If you don’t think you need a full-length rifle barrel to take full advantage of the 9mm round, you may opt for a more compact option. This is also perfect for AR-15-pattern pistols with stabilizing braces and short-barreled rifles.

The Angstadt Arms lightweight-profile AR-15 9mm Barrel is 4.5”, which is roughly equivalent to the Glock 17 service pistol, and features a 1:10” twist rate, like that of the Foxtrot Mike Product’s upper. Angstadt manufactures its barrels using 4150 chrome-moly vanadium steel and applies a Melonite finish for improved corrosion and wear resistance. At this length, you can build a compact 9mm carbine for home defense to maneuver effectively in confined spaces, such as hallways and door frames.

Pistol-Caliber Carbines

There are advantages to using an intermediate- or full-power rifle cartridge if you possess a shoulder weapon for self-defense or hunting. These include:

  • Accuracy and range: A high-velocity cartridge using a more aerodynamically efficient projectile design allows for a flatter trajectory and less wind deflection. It is also less affected by air resistance (drag). While the effective range of a handgun is usually measured in tens of meters (e.g., 25–75), it’s often measured in hundreds for rifle ammunition (e.g., 300–500).
  • Power: Many dedicated rifle cartridges inflict more traumatic wounds due to increased kinetic energy, yaw, tumbling, and fragmentation. These terminal-ballistics phenomena are more common to high-velocity rifle bullets than low-velocity handgun ammunition.
  • Penetration: For hunting, barrier penetration, and penetrating body armor in defensive or tactical scenarios, the rifle cartridge offers increased penetrating power. This can also increase the risk of injuring or killing bystanders, requiring you to carefully manage your ammunition selection and environment.

However, when firing handgun ammunition in a shoulder-fired weapon with a carbine-length barrel, you can take full advantage of the round’s capabilities. There are several reasons to choose a pistol-caliber carbine. These are:

  • Ammunition commonality: One of the most common reasons to carry or own a rifle chambered in a handgun cartridge is ammunition commonality with your sidearm. This was standard practice in the Old West — your Winchester lever-action rifle and your Colt Single Action Army both fired the .44-40 or .38-40 cartridge. If you typically carry a 9mm Glock, a 9mm carbine allows you to draw from the same ammunition pool for both weapons, often using the same magazines.
  • Recoil: Whether you’re comparing a 9mm carbine to a .223-caliber rifle or a 9mm handgun, the 9mm round produces less recoil in a shoulder weapon.
  • Muzzle blast: Firing a rifle cartridge indoors produces a loud and concussive blast, especially when using a short-barreled weapon. If you intend to use your carbine as a home-defense weapon, the 9mm cartridge generates far less noise and flash than a .223/5.56mm, .300 Blackout, or 6.5mm Grendel.
  • Stability: Unlike a handgun, a rifle provides multiple points of contact between you and the weapon. This increases your control, allowing you to manage recoil and muzzle climb, keeping your shots on target. While this is useful for competitive shooting, it’s also critical for self-defense.
  • Power: Although 9mm carbines come in various barrel lengths, those replicating standard-length rifles allow you to squeeze more velocity out of the 9mm cartridge, increasing its range and effectiveness. While this still isn’t comparable to a 5.56mm or .300 Blackout, it boosts the ammunition performance when fired from a handgun.
  • Accuracy: Aside from the longer barrel, the sight radius — the distance between the front and rear iron sights — also increases when using a carbine or rifle. This improves the precision of your sight picture.
  • Accessories: If you opt for a rifle with an M-LOK or quad-rail handguard, you have several points for attaching accessories, such as weapon lights and sighting systems. A light can be a lifesaver when using a rifle for home defense.

In Conclusion

Converting your .223/5.56mm AR-15 to 9mm has several advantages, such as ammunition commonality with your sidearm, reduced muzzle blast, and low-cost plinking. It also has its downsides, such as reduced effective range and power. However, if you’ve determined that the pros outweigh the cons, there are several parts and assemblies that you can buy—these range from bolt-carrier groups and magazine adapters to complete uppers.

Sours: https://acmen.com/best-ar15-9mm-conversion-kits/

Conversion 9mm ar15

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Any 5.56 AR-15 Can Now Take Glock Mags?!

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