The Presma .750 low-profile micro gas block is a build part for AR-15 rifles. Its low profile clears free-float handguards, and the stainless construction resists heat and corrosion. It is sized for .223/5.56 builds with a .750" barrel journal. Features: .750" journal diameter Low-profile micro design, clears free-float handguards Stainless steel construction For .223/5.56 AR-15 builds Includes set screws, gas roll pin, and hex wrench Weighs ~1.5 oz Confirm your barrel measures .750" at the gas port before ordering.