CMMG Low Profile Gas Block AR-15/LR-308 Steel Nitride Finish

A low profile gas block for AR-15 and LR-308 platforms needs to balance reliability with a compact footprint—and the CMMG Low Profile Gas Block does exactly that. Built from 4140 chrome moly steel with a steel nitride finish, this gas block keeps your sight picture clear while delivering the durability you expect from a precision rifle component. Whether you're building a modern tactical rifle, a precision long-range setup, or upgrading an existing platform, a properly installed gas block is critical to consistent cycling and reliability.

The steel nitride finish provides corrosion resistance and a harder surface than bare steel, which matters if you're running your rifle hard in variable conditions—hunting in the field, training at the range, or running suppressed. Chrome moly steel is the standard in quality gas blocks because it handles the thermal cycling and stress of semi-auto fire without compromise. At .750" diameter, this low profile design keeps your handguard and front sight mounting options flexible, making it ideal for both traditional and modular rifle layouts.

Installation screws are included, so you can get to work without hunting for hardware. Proper gas block installation is straightforward if you follow the manual, and a tight, repeatable setup pays dividends in reliability and accuracy over time.

Key Features

• Low profile design for AR-15 and LR-308 rifles
• 4140 chrome moly steel construction
• Steel nitride finish for corrosion resistance and durability
• Installation screws included
• .750" diameter bore

Specifications

Frequently Asked Questions

Will this gas block fit my AR-15 or LR-308?

Yes, this CMMG gas block is designed for both AR-15 and LR-308 platforms with a .750" bore diameter. Verify your barrel's gas block journal diameter before purchasing to ensure proper fit.

What's included with the gas block?

The package includes the gas block itself and the installation screws needed to mount it to your barrel.

Why choose a low profile gas block?

A low profile design minimizes obstruction of your sight picture and handguard mounting surface, giving you more flexibility in optics placement, front sight options, and handguard selection compared to a standard height block.

How durable is the steel nitride finish?

Steel nitride provides a hardened surface that resists corrosion better than bare steel, making it suitable for field use, suppressed shooting, and long-term storage in variable conditions.