This innovative low profile gas block not only weighs less than 2.0 Ounces, but clamps tightly to .750 diameter barrels. The Daniel Defense low profile gas block fits perfectly under all our rails.The Daniel Defense Low Profile Gas Block is constructed from 4150 hardened steel and Military Specification Heavy Phosphate Coating.Solid Steel Construction.Military Specification Heavy Phosphate Coating .Precision CNC Machined.Fits under all our rails.Clamps to barrel.Warranty StatementOur low profile gas blocks carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your gas block shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your gas block in the most expeditious and inexpensive manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer's products. Be sure to retain your sales slip as proof of purchase date when making a claim.