Glock G27 .357 SIG Conversion Barrel, 3.5in

The Glock G27 Conversion Barrel (Glock part no. SP08679) is a factory 3.5-inch replacement barrel chambered in .357 SIG, built to drop directly into a Glock 27 slide. Because .357 SIG and .40 S&W share the same case head diameter, swapping just the barrel lets a G27 shoot .357 SIG with no magazine, slide, or frame changes needed — an easy way to add a flatter-shooting caliber option to a pistol you already own.

Key Specifications

• Chambered in .357 SIG.
• 3.5-inch barrel length, sized for the Glock 27 factory slide.
• Functions as a caliber-conversion barrel, letting a .40 S&W Glock 27 shoot .357 SIG with no other parts changed.
• Ships at approximately 0.22 lb.
• Swaps in as a drop-in replacement for the factory G27 barrel, no other parts required.

Frequently Asked Questions

Do I need to change my magazine to shoot .357 SIG from a G27? No — .357 SIG and .40 S&W share the same case head diameter, so factory G27 magazines feed both calibers; only the barrel needs to change.

Does this fit any other Glock model? This barrel is sized specifically for the Glock 27 factory slide.

Buy the Glock G27 .357 SIG Conversion Barrel, 3.5in

Order the Glock G27 .357 SIG Conversion Barrel, 3.5in from a Lubbock, TX gun shop. Shop more Glock gear or browse the Glock barrels category at Schaefer Defense.