Shooting 9mm in your .40... just a barrel swap away! 

Lenny demonstrates that he is a king among men. He could have taken this opportunity to sell us new mags, but he provided us with intel to enable us to make an informed decision. Exceptional coverage of this topic. Loved how you demonstrated the differences between the two barrels for those needing to know. I also liked how you slowly demonstrated how to take off the slide with cautionary steps. Best video on this topic - Nicely done!

Lenny is "by far" the best teacher with Glocks. Thanks Lenny

Thank you for being honest and not saying you have to get 9mm mags for it to work just so you can sell a few more. I really appreciate it Lenny!

Thanks for the clear/concise video with relevant info- picked up a G17 mag to go with the conversion barrel incase I need an reliable 9mm set up in a SHTF situation. Already put 200 rds through my G22 9mm conversion barrel with 0 issues- actually a lot more fun (and cheaper) than .40 but still using my home defense set up (G22/TLR-2).

I want this guy to teach me everything

Yes. You can use a G31 barrel for a G22, G32 barrel for a G23, & a G33 barrel for a G27, factory or aftermarket. 40 mags work perfectly fine with 357.

I always enjoy your videos....from the old shooting and training videos until these. Thanks Lenny! I learned too much from you.

Lenny is a natural born Salesman. I like to watch him present and talk. You can learn a lot from his body language and how he speaks.

Finally, a straight answer. Good job, Lenny! That's why you have that parking spot with your name on it!

Lenny, your face at 4:51-4:52 compelled me to comment. Your face alone turned that into the longest single second in my life. And ive had some really slowmo action packed single seconds.

If you want full conversion and reliability to carry you need to change the ejector , extractor and spring loaded bearing. Those parts are all different in the 9mm glock 26, 19,17 etc.

I find it funny that youtubers like to safe inspect the gun on camera. And when they don't do it, people freak out as if they were about to be shot at... It's not like a bullet is gonna flight out of your screen.

As clear and to the point as you can get. This guy always has good answers. Thanks

Ive had one of these conversions for years. Love the option . G17 mag's work real well and the added rounds mean LOAD LESS.. My G23 40cal. to 9mm I love it

Just want to mention that the brass to face issue on a Glock 27 G27 Gen 2.5 with a Glock 23 G23 40-9 conversion barrel was resolved with following parts ordered and installed... (1) glsp28927 sp28927 Glock Trigger Housing (Gen 4) 40 S&W (only use the 28926 ejector) (1) Glock OEM Extractor Dep Plunger Spring SP00119/ SP33522 (1) SP01176 Glock Spring Loaded Bearing 9mm & .380 Auto for Non-LCI Extractors, Black (1) SP00098 Glock Extractor 9mm (90°) for Old Style Non-LCI Slides w/ 90° Ejection Port Also, made sure to use 9mm double stack magazines. So, yes, it works. Some have issues, some don't. And some find the right combination of parts to get it to work correctly. Good luck and happy shooting!

I recently got mine and it works flawlessly even with my .40 mags. Thank you Glock Store

Mr Magill is the living example of the American dream. An owner who has a passion for his product and loves what he does. Makes a high quality product at a reasonable price. I love all his videos. Not overbearing sales job, just the fact. You be the judge

I'm thinking the conversion barrel in 9mm might be better because it's thicker and a little heavier. It would negate the little recoil of the 9mm!

This conversion barrel makes the 40 cal glock superior to the 9mm glocks. It's like a glock 22 can double as a glock 17 But the glock 17 is handicapped to only 9mm

OG Lone Wolf 40-9 conversion barrel in a Gen3 Glock22 RTF since 2014. No other mods. Zero issues

I have a Lone Wolf conversion barrel and have at least one stovepipe going through a 30 round qualifying course. That is a 6,12,12 magazine load

Hope this guys is doing well. Clear and transparent.

Lenny is such a great shooter. It's a shame he doesn't have that many new releases for training videos.

Thank you for explaining the differences. I had some parts right and I had some parts wrong in my mind on this one. Straightened me right out Lenny. Thanks.

Thank you for sharing Lanny Magills . It' awesome and very educational video for me

The conversion barrels shoot better because the weight. So comfy.

I got a glock 31 (.357 sig) and ended up get both 40cal and 9mm conversion barrels from lone wolf. And whats awsome is the .357 sig magazines can function with all three calibers. Flawlessly with the 40cal but I can't load a 17 rounds of 9mm in the magazine. The spring pressure is too great and it spits out the rounds after about 8 or 9. Although it didn't seem ol Lenny had that problem.

9mm in .40 mags is a "range only" situation. If you want to plink with that, fine. If you want to concealed carry it, run the proper mags.

I agree. I watch to the end of the video even when I'm not that into the product. I don't even own a .40 Glock, but he holds my attention.

Stuff like this is why I love my Glock!!!

Thanks Lenny, you're a very good teacher , and a credit to all that is Glock :)

Best conversion barrel I've ever bought and real accurate can't wait to Tennessee store opens up right around the corner from me way more accurate than a stock Barrel

You gotta like this guy. Very clear and to the point. I'm looking on your web site right now.

Lenny Magill, would you have any issues converting from .40 to 9mm with just the drop in barrel and 9mm mags for every day carry?

I bought a conversion barrel for my Glock 23. I did use the G23 mag. It worked, but hangs up and the gun jams occasionally. I have a G19 too, and I just use the magazines for that gun. I was planning on getting the 357 sig barrel too, but I can't afford that ammo anymore.

I have your conversion barrel in a Glock 32 (357sig) and have tried using my 357/40 cal magazines but found them unreliable. As you indicate, it works but some times the rounds come out and fail to feed. I won't recommend using other than 9mm mags in a carry or home defense gun.

I swapped in a .357 sig barrel in my glock 23 with no problems. But when i do a 9mm conversion I'll get a glock 19 mag, extractor, and recoil spring, should work perfectly. Love that glock 23

You Can Use 9mm slide it just has a tiny bit of play because 9mm barrel is thinner by .02 roughly so you may lose a little accuracy but will work fine especially for basic plinking

My experience is exactly as he mentions with double feeds using the 40 mag with the 9mm cartridge. The opening of the 40 mag is not tight enough to securely hold the 9mm round reliably. That combination does work but it is not 100% reliable. I have since acquired 9mm magazines to use with my G27 and the GS's 9mm conversion barrel. The is very little wiggle room in the Double Diamond 9mm conversion barrel's chamber. I absolutely had to plunk test every round and test fire to feel comfortable in using this gun as an EDC. Once I had all the kinks resolved, it is a terrific EDC by any measure. My dream gun is a 45ACP in the G27 size frame, as opposed to the bulkier G30 or G36. What I do, however, is to use 200 grain 10mm Speer Gold Dot bullets downloaded to mid-range which practically is a +p 45ACP in the G27 frame. Works for me.

Good to know. This is not the case with my S&W M&P Shield 2.0 chambered in .40sw. I was able to drop in a factory 3.1 inch 9mm barrel for the 2.0 with no problems. The only difference between barrels is the 9mm is maybe a couple thousandths of an inch narrower top/rear part of the hood where the view port is for the loaded chamber indicator. For me it's more accurate and more fun to shoot at the range with the 9mm barrel.

Have a Lone Wolf on my Glock 35 ..... works perfectly ...I use 40 mags all the time for 9mm and have had no issues over a long time .

I just watched an old gunner on RU-vid show that you can take a stock Glock 19 barrel and replace you Glock 32 stock 357 Sig barrel and shoot 9mm, on target, with zero ejector or extractor issues. He shot 30 rounds without a problem!

My every day conceal and carry is a Glock 45 MOS. I like the 9x19 Luger caliber but also love .40 S&W and .357 Sig. if I could easily convert a G45, to accept .40 S&W and/or .357 Sig, I would buy 2 more G45’s immediately. If someone had a .40 S&W G23 slide and barrel and a .357 Sig G32 slide and barrel, I wonder if it could be done then? I would even buy the proper caliber Glock magazines if I needed to as well.

I would change the recoil spring to prevent stovepipes due to the stronger .40 spring shooting weaker 9mm ammo. I have it on my 40-9 conversion and it works flawless. Just order a regular G19/G17 spring and drop it in there when you change your barrel.

FYI Glock Gen 5 guns are not interchangeable with other generation Glocks. So a G22 conversion barrel Gen 1-4 will not work in a Gen 5 G22. As of this date, Barsto is the only 9mm conversion barrel made ($240)for the G22 GEN 5. I found out the hard way.

Man I wish I would have known this before buying my first glock 9mm. Would have definitely sprung for the 40 with the conversion. Still pumped for my glock store order to come in for my g45

Good information. I just purchased a Glock 22 and a threaded conversion barrel. Will be sending the slide to be milled for an RMR and then install a compensator too. Should be sweet!

Great video your very good at explaining everything I'm excited to go out and try my Glock 22 with this barrel. It's like having two guns in ☝️

Great vid! Thank u for positing! Answered a lot of questions!

This has to be the most interesting Glock video ever!

The extractor is at a different angle in the 40cal gun. Maybe the mag doesn’t align properly since its made to align with a 9mm gun. But its cool that it still shoots if you need to use those mags.

love how they don't give any kind of shout out or mention to lone wolf products

This is a great video! All the information that I need! Thanks a lot!

That was fukn awesome lol Lenny good looking out bro very good easy to understand conversion process.Glock is killin it

Ironically; the conversion barrel is a lot thicker; so it's almost like a bull barrel. I'm going to get one!

Not entirely true that it's just a simple barrel swap (at least in my case) I purchased the Double Diamond Premium barrel and used with my brand new never shot Glock 23 gen 3, I had to replace the ejector, when I went to the range and used the original .40 cal ejector it was stove piping practically every other round when shooting with the barrel conversion, (even when just racking it and trying to eject the rounds manually, it keeps jamming) when I called it in to the glock store, they knew right away what's causing it and told me I NEEDED to replace the ejector (Well, so much for Barrel Swap ONLY), luckily the ejector is just a $10 part and they even replaced it for me, I was fine driving 1 1/2 hours away to their store in San Diego only because I wanted to visit the store, for those planning to do the same with their G23, keep in mind that the ejection trajectory will be different once you replace the ejector to 9mm, it'll shoot more upward than just sideways, not super big deal , but had I known about the change in ejection trajectory I might not have gone the G23 route with barrel conversion, I'm glad that the every store personnel I've interacted on phone and at store were very nice, that kind of make up for my disappointment with the barrel conversion

I have an aftermarket conversion G27 storm lake barrel in 9mm for my G27. I have never bought a G26 mag and have shot many many 9mm rounds using the 40 caliber magazines and never had an issue plus you get an extra round. So with the pearce extended G27 magazine it makes the 9mm a 12 shot. I got it for the range because 9mm is cheaper and more pleasant to shoot and if it doesn't work on the range so what, that is the best time to have a malfunction. For protection I put the 40 barrel back in anyway.

I own a glock 27. I purchased a glock 26 non-conversion barrel and bought some 9mm mags I use my g27 to shoot both .40 and 9mm and haven't has a single issue. The aim is right on no matter what barrel I'm using. So in my humble opinion I don't see a need for a conversion barrel

Thanks for a great video. Recently purchased a conversion barrel and was curious as well. Just subscribed.

Follow-up to my earlier post... Just back from the range where I shot 100 x 40SW and 100 x 9mm in a G27 with the lonewolf conversion barrel. Both 40 and 9 mags fed the conversion barrel with zero problems. Silhouette distances were 3, 7 and 10 yards. I was shocked how much tighter my clusters were with the 40s at all distances. I don't know why this would be given the noticeable reduction in recoil with the 9s. Is this the result of lower grains? Cheaper loads? I have never shot 9mm so this is new to me. The fitment of the conversion barrel looks perfect to me. Does it need breaking in? I will practice more with the 9mm because of cost but I would like to know what I am "missing" here. Thanks

Not to take away from how great your videos are but I have to admit you remind me so much of Mike Roe from dirty jobs.

My brother was like you just fucked up by getting a .40 and not a 9, well little does he know I can shoot both and it didn't cost that much at all! He's stuck with his G2C Taurus lol

40cal mag will work perfectly in the third-gen G22, but don't know about the newer gens.

You could also take that G23 and pick up a G32 barrel and then you could shoot .357Sig as well.

Can you use the 22 mags in a 17 though? I don't think there's much difference than what was covered in this video, but I don't a have a 17 to try it out in.

I've actually stuck my factory g17 berral in my g22 slide and it fits perfectly but it does rattle a little because the berral is skinnier but still fires but not as accurate

Great video, wish I would have seen it before i traded my 22 for a 17

That was an amazing situation. TG hanks for the demonstration.

Lenny, Could you do a video on changing the barrel on the G27 to a Glock factory .357 Sig barrel #GB016? No mag change needed, what spring is recomended. etc.

It's not that simple. What he doesn't tell you is that you may have some ejection problems also. Did you that brass to face while he was shooting?

G22 and G17 can swap just have to change magazines also G23 and G19 it’ll be fine all u have to do is change uppers and magazines

Now I Know I’m Glad You Explain it Correct Thanks 👍🏾👍🏾

I'd swap 40 to 357 sig vs 9mm...yeah I know not a popular idea...but I like the 357sig

Mr.Lenny thank you for the knowledge 🙏🏿

Thanks buddy a family friend is selling his .40 so I might just pick this up as well

I've got a question. How does that work in a glock?? 1911s, Taurus, beretta require slide swapped because of the extractor and an ejector swap also to accommodate for the smaller round to function?????

It would of been nice if you showed the actual differences on the hood of the two barrels.😁 "but you can take it down" (by using the specal conversion barrel, eah.)

Lenny long time no watch hope everything is well with your family and such just purchased a Glock 22 Police Trade in Luv it I don’t know why I didn’t buy A 40 caliber before this it’s really just what I was looking for a higher velocity more of a man stoping round but not all of the recoil that comes along with some of the larger calibers I still like 357 there’s nothing wrong with 357 but it’s expensive

Sweet I was shooting in this same exact room as Lenny. Very awesome room.

Can I convert my G 27 .40s&w to a 9mm? I would think so but what barrel do I need?

Good to know. I was given a 9mm conversation Barrell for my Glock 22 .40 and was curious if I had to buy new magazines. Good to know I can shoot off some 9mm ammo that I had laying around for basically free 👍

But Lenny, my 27 I bought the 9mm and 357 the 9mm was your diamond brand and the 357 was a hi end match expensive barrel and they kept jamming and finally gave up. Any ideas please?

Great video, sent it to my son who just bought a G33 in .357 sig.

I thought you needed a different ejector for 9mm when switching from a G23? I know that 357 SIG only needs a barrel swap but I thought the 9mm conversion was a barrel and ejector?

what about turning a 27 into a 9mm?? or it doesn’t work with sub comp./compact

This is a game changer. Adam

I love his voice.

Glock 17 mags, along with this conversion barrel and you're in business to shoot 9mm safely and reliably through a Glock 22.👌🏽👍🏽

barrels for that also. and no need to swap magazines. i'm thinking of that for myself. g-35 with a long .357 barrel

My friend said The double diamond 9mm did not work proper on polymer 80 . Maybe just a out of spec barrell I don’t know but the gold finish was not impressive to say it politely

Damn!!! you're a Great Shooter man!

Now I am confused, because if you google the issue it seems to be more complicated: - The video shows a Gen3. Is it true that in the Gen4 models the 9mm spring differs from the .40? - the ejector differs significant between the calibers. I read that after the conversion, the 9mm cases get weakly ejected. Besides plinking/cheaper trigger control training - would you trust your glock converted just by changing barrel and mag enough to carry it?

The Glockstore claims that you don't have change anything but the barrel. I had ejection problems with my G23 with a 9mm magazine. I changed the ejector and the regular FMJs worked fine but still had problems with hollow points, 30-40% of the time, rounds would not eject. Now I am waiting for my extractor to come in, it should be fine after that. Be prepared to change said parts if you have problems.

Conversion barrels are fine. Almost a thousand rounds in the one I have. Just spend the money for the G17 magazines.

So, If a person had the ability to drill a .40cal hole into the 9mm barrel end of a 9mm slide, that 9mm slide would work with a .40cal conversion barrel, Right? Saying it another way, It's just the pistol barrel Hole that prevents using a 9mm slide from a .40cal Glock pistol conversion? Right?

Lenny, would you trust running that barrel in an EDC G23 without changing the recoil spring; ejector and so on? I would be running 124gr Gold Dot; 127gr +P+ Ranger T or 147gr HST rounds. Thank you brother.

Hey Lenny!! Love your stuff, However now you should Open a Sig Store..🙂👍

I bought a G19 there in 2012.. great store..

Im looking at converting one of my glock 27s gen 3 to 9mm. I have two but no 9mm's. The conversation is far more in my budget than buying a 17 out right. Depending on where you Google it says conversation and 9mm mag, then people start jumping the shark and say Glock 17 mag, Glock 26, Glock 19, blah blah blah. Idealy I want a mag the same size as the 27 40 to stay very concealed. Who is right on the 9mm mag to choose?

As I understand it, you also need to replace the trigger block. Each extractor is different for each caliber.