The Firing Line Forums - View Single Post - glock 27 can use 9mm and .357 sig barrels?

Theohazard · April 23, 2013, 12:45 PM

The barrels for the .357 SIG and the .40 S&W are interchangeable, but the 9mm is not interchangeable with the .357 SIG or .40 S&W; you cannot put a G26 barrel in a G27, or vice-versa.

However, you can get aftermarket 9mm barrels for your .357 SIG/.40, but keep in mind they won't be quite as optimal running 9mm. Everything besides the barrel is the same on a .40 S&W and a .357 SIG, but on a 9mm the slide, ejector, and magazine is also different.

So when you buy an aftermarket 9mm barrel to fit into your G27, the extractor has to move farther inward to grasp the case rim and the ejector is not hitting the case in the optimal way. You also need to use 9mm mags (yes the 33 round mag would work). They still tend to be fairly reliable, but I wouldn't use a gun converted in this way for self-defense.

April 23, 2013, 12:45 PM	#2
Theohazard Senior Member Join Date: April 19, 2012 Location: Western PA Posts: 3,829	The barrels for the .357 SIG and the .40 S&W are interchangeable, but the 9mm is not interchangeable with the .357 SIG or .40 S&W; you cannot put a G26 barrel in a G27, or vice-versa. However, you can get aftermarket 9mm barrels for your .357 SIG/.40, but keep in mind they won't be quite as optimal running 9mm. Everything besides the barrel is the same on a .40 S&W and a .357 SIG, but on a 9mm the slide, ejector, and magazine is also different. So when you buy an aftermarket 9mm barrel to fit into your G27, the extractor has to move farther inward to grasp the case rim and the ejector is not hitting the case in the optimal way. You also need to use 9mm mags (yes the 33 round mag would work). They still tend to be fairly reliable, but I wouldn't use a gun converted in this way for self-defense. __________________ 0331: "Accuracy by volume."