CMMG Inc Gas Block Assembly Low Profile .750in Inside Diameter. 936" ID. Constructed from heavy duty 4142 Chrome Moly Steel these AR Gas Blocks created by the firearm experts at CMMG ensure a flawless cycle and the low profile fits perfectly on your barrel and under your chosen freefloat handguard. An ideal addition to your target rifle and a favorite among varmint hunters the CMMG Inc Gas Block Assembly Kit Low Profile .936 inch ID makes it possible to personalize your gun with your favorite optic or flashlight in an easy to install and easy to understand way. When customization is your end goal you'll love adding the CMMG Inc Gas Block Assembly Set Low Profile .936 inch ID to your favorite AR. Specifications for CMMG Inc Gas Block Assembly Low Profile: Manufacturer: CMMG Color: Black Fabric/Material: 4141 Chrome Moly Steel Gun Model: AR-15 Package Contents: CMMG Inc Gas Block Assembly Low Profile Installation screws What firearm models does the manufacturer say CMMG Inc Gas Block Assembly Low Profile is compatible with? The manufacturer suggests that CMMG Inc Gas Block Assembly Low Profile is compatible with AR-15CMMG Inc 55DA38D: Gas Block Assembly Low Profile .750in ID