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Create and customize your AR-15 your way with the CMMG, Inc. Gas Block Assembly, Low Pro Fits perfectly on your barrel and under your chosen free float 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.