Just curious. Is it possible to buy a 40 caliber conversion barrel for a SD9VE or a 9mm barrel for a SD40VE? Glock does this for the GLOCK27 40 caliber allowing the Glock27 to use 9mm with the conversion barrel and 40 caliber with the original. Since the SD40VE and the SD9VE are virtually the same I thought this may be a possibility. Must use the appropriate magazine of course. So then are the magazines compatible?

The gun is fairly new so nobody makes a kit yet.

In conversions you usually want to go down in caliber (.40 to 9mm) depends on pressures.

I've heard a glock 23 or a SW barrel will work.

Nobdy can actually confirm it though.

I'm talking about going from .40 to 9mm on this.

Personally I don't see why it won't work.

I don't know anybody with a 9mm to take measurements.

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As 3hounds mentioned, you typically only go down in calibers (ie, you can go 40->9, but not 9->40).

Reason for that isn't really pressure (the gun is sold in both forms), but most gun models have a larger diameter barrel for the .40's vs the 9mm. As a result if you plug a stock 9mm barrel for that gun into a .40S&W it'll rattle around and likely not work right, and a .40S&W barrel won't even fit into the 9mm slides.

This is just a matter of convention though - I'm sure somebody somewhere is making a model of pistol where the barrel diameter is the same for both, but its not the norm.

Most "conversion barrels" are made in the .40S&W profile but with a 9mm bore. You just plug in the barrel and a 9mm mag and blast away.

That said, I don't see as much value in it for the SD series as some guns. Conversion barrels are an aftermarket proposition - companies like Lone Wolf and Storm Lake make them. Price for a 40 to 9 conversion barrel is typically around $125. You also need at least one magazine which will run about $35. With those two you're up to $160. Though right now things have gone crazy the SD9VE's are normally a ~$300 gun and you get two mags. I don't see the economy of converting when the conversion exceeds 50% the cost of a new gun.

That factor may explain why they don't make one (and never made one for the Sigma .40 either to my knowledge, despite it being around for nearly 20 years).

You cannot fire .40 in a 9mm pistol by a simple barrel conversion. The breech face on the two calibers are not the same. For the same reason, you should not fire 9mm in a .40 pistol, although there are those that will come along and say it is perfectly ok. S&W does not think it ok, and I would certainly not rely on it for self-defense.

The easiest conversion is .40 to .357 SIG because the two cartridges have the same head dimensions, thus the breech face is the same. Unfortunately, I have never heard that S&W makes a .357 SIG barrel for the SD40VE.

Lone Wolf Match Grade Barrel GLOCK 22 31 Conversion .40 S&W To 9mm Standard Length LWD-229N

You can shoot 9mm in a .40 cal pistol.

You also need a 9x19 magazine for reliable feeding.

I'm just amazed how many times this exact thread comes up.


Besides needing the entire slide assembly. The .40 mags don't fit the 9mm frame and the 9mm mags are too loose in the .40 frame. Unless I missed something and Smith made the frames and mags the same on all the sdve. They aren't the same in the sigma.

Some you do and some work with .40 mag.

I'm talking about the Glock here.

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I've gone down that 9x19 in a .40 S&W magazine during the Clinton era. They all worked just ok. If I were that desperate to shoot 9x19, personally I would just buy one rather then getting a barrel for my .40 S&W.

Different strokes for different folks, I guess.