The TROY Low Profile Gas Block .750" is specifically designed for rifle barrels with a 0.750 gas block seat. Its low-profile design allows for clearance of most aftermarket rails that require a smaller gas block. Machined from 4140 pre-hardened steel, it is finished with MIL-STD Manganese Phosphate for durability. The gas block fits tightly to the barrel using two set screws, ensuring a secure installation. Note that a gas tube roll pin is not included.