The Troy Industries Low-Profile Gas Block - .750" features pre-hardened 4140 steel construction with a Mil-Spec manganese phosphate finish for unparalleled durability, offering faithful service with most AR-15 rifle barrels with a .750" gas block seat. The low-profile design offers maximum clearance for dependable service with free-float handguards. Includes set screws. Does NOT include gas tube or gas tube roll pin. .750" profile. Made in USA.