The low profile gas block for .625 diameter barrel is constructed of 1141 high strength steel with a magnesium Phosphate finish. This gas block is held in place by 2 10-32 set screws. Gas block is 1.3in tall 1in in length and is .625in from bore center to gas tube. The block is .775 in width and comes with a roll pin. From the back of the gas block to the gas port hole is .250. This leaves .035 between the back of the gas block and most steps in the barrel. This is for installing of the A2 style hand guards. So there should be a .035 gap between the barrel step and the gas block. This can be filled with spacer or leave empty. Specifications for Precision Reflex PRI Low Profile .625 Diameter Gas Block: Manufacturer: Precision Reflex Color: Black Fabric/Material: 1141 Steel Gas Block Journal Size-Diameter: .625 in Gas Port Size: 0.25 in Gun Make: AR Platform Gas Block Journal Size-Length: 1 in Finish: Magnesium Phosphate Package Contents: Precision Reflex PRI Low Profile .625 Diameter Gas Block
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