Vltor Weapon Systems Gb-2C Clamp-On .750 Bore Blk

The Vltor Weapon Systems GB-2C is a clamp-on gas block designed for AR-pattern rifles with .750-inch bore barrels. If you're building or upgrading a mid-length or rifle-length AR, this gas block handles the critical job of regulating gas flow from your barrel to the bolt carrier group. The clamp-on design means you don't need to drill and pin your barrel—installation is straightforward and non-permanent, making it a practical choice for builders who want to keep their options open or swap components down the road.

Vltor's reputation in the AR community comes from solid engineering and no-nonsense functionality. The GB-2C delivers that same approach: a simple, effective gas block that does the job without unnecessary complexity. Whether you're running a designated marksman rifle, a precision build, or a general-purpose upper, a properly set gas block is foundational to reliability and controllability. The .750 bore measurement is critical—it's the internal diameter of your barrel's gas port, and getting the right size ensures your gun cycles as intended.

Built in the USA, this black-finished gas block is compatible with standard AR-15 barrel profiles and setups. It's the kind of component that doesn't draw attention until something goes wrong—and a quality clamp-on gas block from Vltor helps make sure that doesn't happen.

Key Features

• Clamp-on design—no drilling, tapping, or permanent modifications to your barrel
• Sized for .750-inch bore barrels (verify your barrel's gas port diameter before purchase)
• Black finish
• Usa-made by Vltor Weapon Systems

Specifications

Frequently Asked Questions

Will this gas block fit my AR-15 barrel?

The GB-2C is designed for barrels with a .750-inch bore diameter. This is a specific measurement of the internal diameter of your barrel's gas port. Verify your barrel's bore size before ordering—using a gas block sized for the wrong bore will prevent proper operation.

Do I need to drill my barrel to install this gas block?

No. The clamp-on design secures to your barrel without drilling, tapping, or pinning. This makes installation simpler and allows you to remove or swap the gas block if needed.

Is this gas block made in the USA?

Yes, Vltor Weapon Systems manufactures this gas block in the United States.