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The CMMG Gas Block assembly Low Profile .625" ID is engineered for AR-15 and compatible rifle platforms utilizing barrels with a .625-inch diameter at the gas port. Designed for shooters and builders seeking a streamlined, reliable gas system upgrade, this low-profile gas block fits beneath most free-float handguards, supporting both tactical and competition applications.
Product Overview
Manufactured by CMMG, this gas block assembly is machined from durable steel, ensuring long-term reliability and resistance to heat and corrosion. Its low-profile design allows for greater customization, particularly for rifles with slim or lightweight barrels where space under the handguard is limited. The .625" internal diameter provides a precise fit for compatible barrels, promoting consistent gas flow and reliable cycling. This assembly is suitable for direct impingement gas systems and is commonly used in AR-15 builds that prioritize weight reduction and improved handling. Installation hardware is typically included, facilitating straightforward attachment with standard tools.
Technical Specifications
Feature
Specification
Manufacturer
CMMG
Model
CMMG Gas Block assembly Low Profile 625" ID
Category
Rifle Accessories – Gas Blocks
Material
Steel
Finish
Matte black (phosphate or nitride, depending on batch)
Internal Diameter
.625" (15.88mm)
Profile
Low Profile
Compatibility
AR-15 and similar rifles with .625" gas port barrels
Mounting Method
Set screw attachment
Gas System Type
Direct Impingement
Weight
Approx. 1.5 oz (varies slightly by batch)
Included Hardware
Set screws, gas tube roll pin (if supplied by manufacturer)
Further Product Details
This CMMG low-profile gas block is ideal for AR-15 owners upgrading from standard A2 front sight blocks or building custom rifles where maximum handguard clearance is required. Its compact form factor ensures compatibility with most aftermarket free-float handguards and slim-profile builds, making it suitable for lightweight, competition, or tactical rifles. The assembly typically includes set screws for secure mounting and may include a gas tube roll pin, though customers should verify included items at the time of purchase.
Installation requires basic gunsmithing tools and attention to proper alignment over the barrel’s gas port for optimal function. Routine inspection and cleaning are recommended to maintain reliable gas flow and prevent carbon buildup. In South Africa, ensure compliance with all local firearm regulations regarding modifications and parts installation. CMMG provides a manufacturer’s warranty covering material and workmanship defects, offering additional confidence in the product’s durability and performance. For best results, consult your rifle’s manual or a qualified gunsmith when upgrading or replacing gas system components.
