Glock 47740 | G21 Threaded Barrel | .45 ACP

This is a threaded replacement barrel for the Glock G21 platform, listed as Glock part number 47740. It is specified for .45 ACP and is finished/constructed as black steel. The barrel is intended to fit Glock 21 Generation 3 and Generation 4 service pistol frames and ships with a metal thread protector installed.

Product Specifications

• The manufacturer is Glock.
• The manufacturer part number is 47740.
• The model is listed as G21.
• The caliber is specified as .45 ACP.
• The barrel is threaded with a 578 X 28 RH metric thread pattern, as provided in the source text.
• The barrel fits Glock 21 Gen3 & Gen4 pistols.
• The finish/material is listed as Black Steel.
• The product includes a metal thread protector.
• The category is Glock Barrels.
• The short description provided by the source is Glock 47740 G21 45 ACP Threaded Black Steel, Fits Glock 21 Gen3 & 4.
• The UPC is 764503030611.

This threaded replacement barrel is useful for range-oriented shooting where a threaded muzzle is desired and for suppressor-compatible builds when local and federal law permit. It also serves as a direct replacement part for shooters maintaining or customizing Glock G21 pistols on Gen3 and Gen4 frames.