Glock Thread Protector | G21 Gen4 | .45 ACP | M16x1LH

This is a Glock factory thread protector intended for the G21 Gen4 in .45 ACP. It is specified with M16x1LH left‑hand threads and supplied in a black package. The protector preserves muzzle threads when a threaded muzzle device is not installed.

Product Specifications

• The product name is Glock Factory Thread Protector for .45 ACP G21 Gen 4 M16x1LH Black Pkg.
• The manufacturer is Glock.
• The intended firearm compatibility is G21 Gen4 for the listed caliber.
• The caliber is listed as .45 ACP.
• The thread pitch is M16x1LH (left‑hand).
• The color is listed as Black.
• The UPC is 764503060656.
• The listed weight is 0.047 (units not specified in source).
• The listed shipping weight is 0.047 (units not specified in source).
• The category is Other Glock Accessories & Parts.
• The product image URL is https://media.chattanoogashooting.com/images/product/GL70338/GL70338-1.jpg.
• The packaging designation in the source is Pkg.

This factory-fit thread protector provides straightforward protection for the muzzle threads of a threaded G21 Gen4 barrel during storage and while alternately installing or removing threaded accessories. Its specification matches Glock factory parts practices and is intended for users who want an OEM‑compatible option for thread preservation and routine maintenance.