The Iver Johnson 1911 Government 5.75in Threaded Barrel (brand part no. IJ1911GTBBL45) is a .45 ACP replacement barrel sized for Government-size 1911 pistols, cut to 5.75 inches and threaded for a suppressor or muzzle device. It’s finished in black oxide and rifled with a 1:16-inch twist across six lands and grooves, and it ships with a thread protector cap so the .578×28 TPI threads stay covered when nothing else is mounted. Some fitting may be required during installation, and this barrel does not include a barrel link or link pin, so a shooter will need to reuse or source those separately.

Key Specifications

• Chambered in .45 ACP.
• Cut to 5.75 inches, sized for a Government-size 1911.
• Threaded .578×28 TPI (3/8in) for a suppressor or muzzle device.
• Rifled with a 1:16-inch twist across six lands and grooves.
• Finished in black oxide.
• Includes a thread protector cap for when nothing else is mounted.
• Some fitting may be required during installation.
• Does not include a barrel link or link pin.
• Sized for a Government-size 1911 frame.

Frequently Asked Questions

What thread pattern does this barrel use? .578×28 TPI (3/8in), a common suppressor and muzzle device thread for .45 ACP.

Does this barrel include a link and link pin? No, it does not include a barrel link or link pin.

Will this barrel need fitting? Some fitting may be required to get a proper lockup in a Government-size 1911.

Buy the Iver Johnson 1911 Government 5.75in Threaded Barrel

Get a threaded .45 ACP barrel ready for your next suppressor or muzzle device project. Order the Iver Johnson barrel from our gun parts and accessories selection at our Lubbock, Texas gun shop as soon as it’s ready to ship.