This Shadow Systems locking block (brand part no. SG9C-01-24) is a direct-fit replacement part compatible with both Glock Gen 3 and Gen 4 frames, the component that houses the barrel and slide-lock function within the polymer frame. This handgun part is an essential internal frame component.

Key Specifications

• Compatible with Glock Gen 3 and Gen 4 frames.
• Functions as the locking block housed within the polymer frame.
• A steel insert that the barrel locks against within the polymer frame.

Frequently Asked Questions

Will this fit a Gen 5 Glock? No, this locking block is built for Gen 3 and Gen 4 frames specifically; a Gen 5 pistol uses a different locking block.

What does a locking block do? It’s a steel insert molded into the polymer frame that the barrel locks against and that helps retain the slide-lock lever.

Buy the Shadow Systems Locking Block for Glock Gen 3 & Gen 4

A worn or damaged locking block is a straightforward, direct-fit repair for a Gen 3 or Gen 4 frame. Order it from our Lubbock, TX gun shop for fast, insured shipping.