The CMMG Zeroed Adjustable Gas Block (brand part number 55DA31F) fits a .750-inch gas block journal and gives an AR-platform builder a tunable way to dial in gas flow for a given load, buffer weight, or suppressor setup. CMMG machines the block from 4140 steel and finishes it in a durable nitride coating for corrosion resistance and long-term wear. Because it’s part of CMMG’s Zeroed line, it’s built to the same tolerances CMMG uses across its own rifle platforms, giving builders a dependable, adjustable gas system component instead of a generic, one-size-fits-all fixed block. It’s a straightforward way to fine-tune reliability on a suppressed build or a rifle running a range of ammunition.

Key Specifications

• Sized for a .750-inch gas block journal.
• Built as an adjustable gas block for tunable gas flow.
• Machined from 4140 steel for durability.
• Finished in a corrosion-resistant nitride coating.
• Part of CMMG’s Zeroed component line.
• Weighs approximately 0.167 lb, adding minimal weight to the barrel.

Frequently Asked Questions

What barrel journal does this fit? A .750-inch gas block journal.

Why choose an adjustable gas block? It lets you tune gas flow for a specific load, buffer weight, or suppressor setup.

Buy the CMMG Zeroed Adjustable Gas Block – .750 Inch, Nitride 4140 Steel

Fine-tune your gas system instead of fighting a fixed block. Order it from our CMMG lineup, part of our AR gas system selection, at our Lubbock, Texas gun shop for fast, direct shipping.