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How to Convert a Glock 21 to .45 Super

Updated on May 2, 2012

Safety First!

If you're reading this, chances are you know what a .45 ACP cartridge is, as well as a .45 Super cartridge, and are interested in how to modify your Glock to fire .45 Super. If you don't, check out this article on the .45 Super. That is all well and good, and easily possible, with a bit of time and research. There are just a few things to note, before we get started.

First, remember that many .45 Caliber handguns, especially older ones, are not built to withstand the increased pressures and stresses of the .45 Super cartridge. We will be working with Glock, which can withstand such, but not without certain modifications. Use of an improperly set up weapon can and will hurt the weapon and you.

Secondly, remember that even if a weapon can withstand the shock of firing a more powerful round, they are not designed for it. Increased wear and tear will occur, especially if you intent to fire .45 Super out of it on a regular basis.

Thirdly, keep in mind that THIS WILL VOID THE WARRANTY. Glock will not be happy that you have modified their weapon, and if any damages occur to the weapon, they will not fix it for you.

DISCLAIMER: I have done research on my own, and have every reason to have confidence in the information provided here. However, neither I, nor Hubpages, may be held responsible for any damages caused to yourself, or to your firearm. Yes, this is the "cover my own rear" section. I carry one of these weapons myself, every time I go out the door, and have complete faith in it.

What You Will Need

There are a number of places you can find information on the .45 Super cartridge, and .45 Super conversions. In fact, the first search term will bring you to Ace Custom 45's website. They sell a "conversion kit" for the Glock 21 to allow it to safely fire .45 Super. If you purchase their kit, which sells for a hair under $400, you will indeed be able to fire .45 Super safely out of your Glock 21. You'll also have such improvements as an extra power magazine spring, a Pearce Glock grip enhancer,and a Jentra Glock grip plug nose, none of which you need to fire .45 Super. They also demand that you have the slide ported by a company of their choosing.

Now, it goes without saying, you don't need all of this. You can buy your own grip enhancer and plug from a dealer of your choosing, at a time of your choosing. The magazine spring, I have never once needed thus far. Porting is another issue altogether. It will reduce wear and tear on the frame, as well as felt recoil. it will also render it less effective as a defense weapon, causing blindness at night, and possibly burning you with hot gasses if you have to draw from retention to protect yourself.

If you simply want to convert your Glock to .45 Super, with out all the frills attached, here is what you will need:

Performance Barrel

You may be thinking "Oh, my stock Glock barrel can handle this round just fine, I don't need to purchase a new one." You might also be right, but I would point out one thing. Glock's barrels do not fully support the shell casing of .45 ACP rounds; the cartridge hangs over the edge of the feed ramp, leaving an area of unsupported shell. Do you really want a cartridge with that much more power unsupported in any way, when the result could be the destruction of your firearm?

Stock Glock barrel with unsupported portion.
Stock Glock barrel with unsupported portion.

Which Barrel Should I buy?

There are several companies with fantastic reputations to purchase from, and all of them will have great performance. The largest deciding factors are price and looks. These are a few of the options:

  1. KKM Precision: 416 stainless steel. 42 -45 RC. Button Rifled. Threading and 6" options. Base Price: $165.00
  2. Storm Lake: 416 stainless steel. 40-42 RC. Cut broach rifled. Steel or Black color options; 6" or threaded barrel options. Base Price: $160.00
  3. Bar-sto: Cut Broach Rifled. Available to be match fitted. Base Price: $215:00
  4. Jarvis: 4140 weapon steel. 40-44 RC. Available to be match fitted. Base Price: $200.00
  5. Lone Wolf Distributors: 416 stainless steel. Cut broach rifled. Lifetime warrenty. Base Price $109.95
  6. EFK Fire Dragon: 416 stainless steel barrel. Threaded or un-threaded. - Price:$150.99 / 220.00 Threaded

What you choose will depend on what you like, and what you intend to use it for. I personally have a KKM Precision standard 4.60" barrel. Lone Wolf Distributors is a good, affordable option, if you can stomach the silly wolf icon they insist on scrawling on the top of the breechblock. I believe you can pay them to put it underneath, where it isn't visible, and still come out on top. I would also highly recommend Storm Lake, as they offer a black finish, if you can wait 30 days for it.

Personally, I would stay away from EFK Fire Dragon, as I have heard mixed to bad things about the company and its support, including one horror story about the quality of a barrel made by them.

KKM Precision Barrel with fully supported chamber.
KKM Precision Barrel with fully supported chamber.
Stainless steel guide rod with 24 pound recoil spring.
Stainless steel guide rod with 24 pound recoil spring.

Aftermarket Guide Rod and Spring Assembly

3rd generation and previous Glock 21s have a single plastic guide rod and 17 pound recoil spring in them. Firing .45 Super rounds out of a Glock with a stock 17 pound recoil spring would have the slide slamming into the frame with great force with each pull of the trigger. I'm not sure how long it would take to damage the gun irreparably, but I know I wouldn't want to be the one who's Glock was used to test it.

To remedy this, the solution is simple. You have to replace the recoil spring. In Glocks, the guide rod is permanently attached to the spring, it is a captive, non-separable assembly. That means that while you're at it, you might as well buy a stainless steel guide rod. The stock plastic ones reek of cheap and flimsy, in my opinion, anyway.

You'll need a recoil spring rated at anywhere from 22 to 26 pounds. Personally, I chose 24, because I can still fire .45 ACP without any reliability issues with it, but if you're intending it to be .45 Super only, I'd recommend 25 or 26.

You can buy recoil springs and guide rod assemblies from almost anywhere, and they tend to be reliable. Personally, I chose a Lone Wolf captive guide rod, with ISMI recoil spring. You can find both of those at Lone Wolf Distributing's own website. Make sure, if you choose a captive guide rod assembly, to put some Loctite or similar product on the screw. It won't do anyone any favors if your guide rod comes apart while the weapon is being fired.


Glock 21: Chambered for .45 ACP/.45 Super

Yes, its that simple. A drop in barrel, and a new guide rod and spring assembly. Once you have your fully supported barrel, and guide rod and spring assembly, simply assemble them as necessary, and drop them into your Glock, and viola, you can now shoot .45 Super cartridges. Remember, before you drop the parts in, to clean and oil them. You don't want any dirt or debris picked up during shipping to make it into your Glock.

Below is a picture of my own Glock 21, modified to shoot .45 Super. It is my Everyday Carry weapon, and it has run about 500 .45 Super rounds through it with no difficulties and no noticeable damage, wear, or tear. Your mileage may vary.

My 3rd Generation Glock 21, with .45 Super modifications.
My 3rd Generation Glock 21, with .45 Super modifications.

As always, thanks for reading. I hope someone out there found this helpful. Feel free to drop me a comment if you thought it was helpful, horrible, or simply wanted to make a correction to something I've said.

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    • profile image

      Normanrea 2 months ago

      Thanks. I found your article very informative. I'm a 45 acp nut.

      Norm

    • TomBlalock profile image
      Author

      TomBlalock 3 years ago from Hickory, NC

      Understandable. Hydra-shok isn't bad, in all honesty, but it does have a pretty massive tendency to get clogged by clothing and become a glorified round nose, but a bullet in the body is still a bullet in the body. I wouldn't be the one wanting to get shot by it, one way or another. Then again, I hadn't planned on getting into any running gunfights with police, either. Typically bad for one's health.

    • profile image

      j Michigan 3 years ago

      The reason why i know about the perp having 8 rounds in him and one through heart was from the autopsy report although i was quite confident my rounds were hitting their mark. When he stood up i only fired one more round which was a headshot an inch above his left eye. I know now he would have breathed his last from the heart shot on a few more seconds but those are crucial considering he had 3 more 9 X 21 rounds left.

    • profile image

      j Michigan 3 years ago

      We are now permitted to carry glock 9mm, 40, ot 45 acp. And i have many questions for you TomBlalock. I do not know how to receive alerts on this website and i have more detailed info that I'd rather not post publicly.

    • profile image

      j Michigan 3 years ago

      Oh and btw sig p226r with garbage dept issue 9mm subsonic 147 gr hydroshok

    • profile image

      j from Michigan 3 years ago

      I really appreciate your response and completely understand your skepticism. Is there anyway we can communicate other than through this thread. Please feel free to email me @ johnmatthesjr3@gmail.com

    • TomBlalock profile image
      Author

      TomBlalock 3 years ago from Hickory, NC

      That's... slightly insane. I know it can happen, but that's crazy. If I could ask, what caliber cartridge and what firearm were you using? I'll say I'm inherently skeptical, because I'm always skeptical, but if what you're saying is true, then congratulations on surviving and nailing the bad guy. Generally speaking, anyone who brings a vest to a gunfight means serious business. I'd be happy to answer any further questions you have though, if you would like, although I'll make no claim to expertise in the field.

    • profile image

      J from Michigan w/o typos 3 years ago

      Great article! I'm a police officer and was involved in a shooting that put 8 rounds (1 in heart) and the gunman got back on his feet. It took a 9th round (headshot) to put him down. All this while dealing with the other perp who had a shotgun. I want a round that puts a MF down fast! The shotgun guy had a BP vest and i still severed his femoral artery And shattered his OTHER femur......he lived! But at least i stopped him from shooting at me. I have many questions for you. Please respond TomBlalock and I'll give you my email. I really need your expertise!

    • profile image

      J from Michigan 3 years ago

      Great article! I'm a police officer and was involved in a shooting that put 8 rounds (1 in heart) and the gunman got back on his feet. It took a 9th round (headshot) too but him down. All this while dealing with the other perp who had a shotgun. I want a round that puts a MF down fast! The shotgun guy had a BP best and i still severed his femoral artery And shattered his OTHER femur......he lived! But at least i stopped him from shooting at me. I have many questions for you. Please respond TomBlalock and I'll give you my email. I really need your expertise!

    • TomBlalock profile image
      Author

      TomBlalock 3 years ago from Hickory, NC

      I don't fire too many from mine, these days, either. I keep it as a wilderness defense option, since we don't really need high caliber weapons here in North Carolina for the wildlife. Chances are, I'll never use it, but I'm a huge fan of deep wilderness hiking, and I'd rather have it than not.

    • profile image

      GlockGeek 3 years ago

      Thanks a lot TomBlalok. I'm originally from NC although in the Northwest now. The ability to fire .45 super just gives me additional options in the out doors here. I probably won't run more than 100 rounds a year of .45 super through it but having that option is very useful here.

    • TomBlalock profile image
      Author

      TomBlalock 3 years ago from Hickory, NC

      In my personal opinion, Glock GEEK, no. You don't need any of those for a Glock 21 to fire .45 Super or .45 ACP flawlessly. I haven't had any issues with mine since the day I bought it, save for one failure to fire with a standard .45 ACP. That was before my modifications, as well. Since then, it's been smooth sailing.

      The buffers are simply a way to reduce stress on the frame from the extra force imparted to the slide. It's a good idea, in all reality, but I haven't heard good things about them. If you're going to give it a try, I'd recommend Wilson's combat buffers, if they still make them.

      The magazine spring in particular makes me kind of scratch my head. The cartridge weight is more or less apples to apples, since the dimensions are identical to the original .45 ACP, save with stronger webbing and more modern powder. I don't see why you would need a beefier magazine spring for it.

      In summary, my opinion is that no, you don't need the other parts. I certainly haven't, and I've no complaints so far either.

    • profile image

      Glock GEEK 3 years ago

      Loks like this is over a year old. I was wondering how your firearm was holding up with this conversion. Barrel and recoil spring and guide rod is all that you used. I have seen others say that you need a different firing pin spring, buffer, magazine spring or magazine. Are all of these other parts necessary. I have a new Gen 3 G21

    • profile image

      wayne 4 years ago

      Hello. I have a Sig P-220 in 45 ACP do you know where I can get the item's to convert the Sig to 45 super ?

      Thank you for your time

    • TomBlalock profile image
      Author

      TomBlalock 5 years ago from Hickory, NC

      Honestly, the Glock OEM barrel is very accurate out of the barrel. The KKM has better support, which is good, but mine wasn't fitted by KKM, so it isn't a flawless fit, either. As for accuracy, the KKM is as accurate as I need it to be, and far more accurate than I can manage, at current. So, do I believe there is a difference? Sure, but it is very small, and it will be a long time before I'm good enough to notice it. I still highly recommend it though.

    • profile image

      TokarevCzar 5 years ago

      Do you notice the kkm barrel shoots more accurately?

    • TomBlalock profile image
      Author

      TomBlalock 5 years ago from Hickory, NC

      Well, with that being the case, is there anything I can do to help you learn more, or is there anything specific you want to know? I'm always happy to discuss just about anything with anyone, so just let me know!

    • pstraubie48 profile image

      Patricia Scott 5 years ago from sunny Florida

      Hi I know like nothing about gun. My son-in-laws uncle has a whole collection. After reading this I am curious and want to learn more. Thanks for sharing thils.

    • flacoinohio profile image

      flacoinohio 5 years ago from Ohio

      What is the difference between the .45 and the super .45? I use the glock 22 personally, I am more comfortable with the .40 cal. I can use multiple grain ammunition without modifying my weapon.

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