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Discussion Starter #1
Just picked up a Glock Model 40 MOS (10mm). For training purposes I would also like to be able to shoot .40 S&W with it. While this arguable can be done with no changes whatsoever, I would prefer a dedicated .40 S&W barrel for it. Does anybody know if the Glock Model 24 (.40 S&W) barrel will drop right into a G40? While they are the same length, I cannot find any info on dimensions of the hood (like width) or whether there are other differences (lug or ramp) between the two. I realized there are aftermarket conversion available to do this from KKM and LW. Any others to consider (that don't require a file/gunsmith)?
 

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I'd bet that the lugs are different, but don't know for sure. A call to Glock/Smyrna will probably get you the real answer.
 

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I asked them a question about conversion, and while they said some owners do it, they do not reccomend it, so they did not offer any useful info.

I have landed on the opinion that if I want to shoot a different caliber from one of my pistols, I will get that caliber piostol.

I suppose it's fine to change out barrels in a pinch (in cases of ammo shortage), but for me, I'm gonna keep the caliber pistol laying around so that it's dedicated. I.e. I'm beginning to want .357 and 10mm. I had been wondering if I could switch barrels in one of my 21's to shoot 10mm. That was when I called to ask ehte question. They did say there were aftermarket companies who do this, but not rec'd by Glock.
 

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I asked them a question about conversion, and while they said some owners do it, they do not reccomend it, so they did not offer any useful info.

I have landed on the opinion that if I want to shoot a different caliber from one of my pistols, I will get that caliber piostol.

I suppose it's fine to change out barrels in a pinch (in cases of ammo shortage), but for me, I'm gonna keep the caliber pistol laying around so that it's dedicated. I.e. I'm beginning to want .357 and 10mm. I had been wondering if I could switch barrels in one of my 21's to shoot 10mm. That was when I called to ask ehte question. They did say there were aftermarket companies who do this, but not rec'd by Glock.
Tim, your anecdote isn't really germane to the OP's question, as the 10mm/.45acp conversion was/is unique. Dropping a factory .357 Sig barrel into a Glock .40 isn't really a conversion, I suppose. However, conversion barrels such as the LWD, etc., .40-to-9mm work fine.

I got sucked into the .45ACP to 10mm conversion barrel scam. I tried around 1000 rounds, trying different "tricks" in loading, filing extractor pads, etc., and never got reliable extraction. The fact is, there's no extractor tension on the 10mm case, using a .45ACP extractor, and the 10mm (G20) extractor won't fit in the G21 slide.

I've fired over 10,000 .400 Cor-Bons and over 3000 .40 Supers through G21s, with reliable function ONLY with 10-round, Klintonista mags. :cool:The best two groups that I ever shot with one of my handguns at 100 yards were two sub-5", five-shot groups shot through a .40 Super barrel in a G21.
 

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I'd bet that the lugs are different, but don't know for sure. A call to Glock/Smyrna will probably get you the real answer.
I submitted an inquiry through Glock's online system, but no word back yet (there was a note that said they were slow due to a large volume of requests). If the G24 barrel will not fit the G40, I would hope they'd tell me straight up. But I doubt they would encourage swaps, even if it happens to fit.

I generally agree that it would be best to have dedicated pistols for each cartridge, but I have extra large hands, which makes the large frame a better option for me. If I understand correctly, that limits me to .45 ACP or 10mm, unless I go the conversion route, and neither of those cartridges seem quite as economical as the .40 S&W. Worst case, I will simply find some moderate power 10mm for light duty purposes, but the .40 S&W option seemed viable since the extractor and ejector match straight across.
 

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Walter is right, I got off the subject;

OP: Yep, you right. Glock will not encourage a swap. They will sell you a barrel though....
 

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I'd suggest that the op try a Lonewolf conversion barrel. Pretty sure the offer .357 sig and .40. Either would cost less than a factory 24 barrel. Since the 20 is a large frame and 24 small, lugs probably won't fit.
 

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I submitted an inquiry through Glock's online system, but no word back yet (there was a note that said they were slow due to a large volume of requests).
The secret to Glock customer service is to pick up the phone and call, they are old school. A live person will answer the phone and connect you to someone who can help. Responses to their general e-mail boxes . . . it's not advisable to hold your breath :D

I'll go a little contrary to the feedback so far, I believe Glock will tell you straight up if it works or not. It would have to be a G24 barrel - they are the same length but the width of the G40 pistol is 2.5mm wider than the G24. If any of that difference is in the thickness of the barrel (which I'm guessing it probably is) then the factory G24 barrel won't work.

I don't think that's a bad thing, I personally would be more comfortable with a reputable conversion barrel knowing it was built exactly for the purpose you want.
 

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My experience, and I offer it as anecdotal and not advice, is that the 10mm Glocks shoot 40 just fine with no changes. My Gen 3 G20 has seen well over 1000 rounds of 40 through it alternately with several thousand 10mm. Not a single hiccup ever. No ftf, fte, or ft anything else.

Again though, just sharing my experience.

Sent from my SM-G928V using Tapatalk
 

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I have been wondering that myself because i've been wanting a G24. My local gun shop has a G40 MOS in stock and I was thinking of trying to make my own G24 and still have the option of using it as a G40 as well. Since the 10MM and .40 are different length cartridges, I was wondering about the headspace and if it could chamber and feed a .40 into the 10MM barrel. A little digging on the Storm Lake website shows they offer a conversion barrel for using a .40 in the shorter G20(10MM) version, but not one for the longer G40. So i'm just wondering why they feel the need for a "conversion" barrel if what you're saying is an alternative. I know other brands like Coonan offer a .357 Magnum in a 1911 style looking frame. And it can also chamber and fire without issues a .38 Special, which is the same difference to me as the 10MM vs. .40 length-wise. So you're saying you are loading the .40 bullet into the stock 10MM magazine and its feeding and chambering, firing and ejecting from the factory 10MM barrel with no issues?
 

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KKM makes a .40 conversion match barrel for the Glock 40. It's $165 and I bought one right with my Glock 40 MOS GEN4. It works marvelously!!
 
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