Luth-AR .750 Adjustable Gas Block Features The Luth-AR Adjustable Gas Block is machined from 4140 chromoly steel a material chosen for its strength and ability to handle the heat and pressure cycling through an AR-15 or M16 gas system shot after shot. An 8-32 x 3/8 inch gas adjustment screw lets the shooter dial in exactly how much gas is diverted back into the system a useful feature for tuning cycling reliability with suppressors or varying ammunition loads. Two 1/4-20 x 3/16 inch set screws secure the gas block firmly to the barrel while an included roll pin pins the gas tube in place for a stable dependable connection. Sized for a .750 diameter barrel this gas block fits a common barrel profile used across many AR-15 builds. A black nitride finish adds corrosion resistance and a durable surface hardness that holds up to repeated heat cycling near the chamber. The low profile design keeps the gas block s height to just 1.33 inches allowing it to sit cleanly under most free float handguards without interference. At only 1.6 oz this gas block adds negligible weight to the completed rifle while delivering real tuning capability to the gas system. Made in the USA the Luth-AR Adjustable Gas Block gives AR builders a dependable American made option for fine tuning their rifle s reliability. Luth-AR .750 Adjustable Gas Block Specifications Manufacturer: Luth-AR Model: .750 Adjustable Gas Block Compatible Hosts: AR-15 / M16 Color: Black Finish: Black Nitride Material: 4140 Chromoly Steel Diameter: .750 Length: 1.04 Height: 1.33 Weight: 1.6 oz Available At: GrabAGun