The AIM Sports XDB15RGAST AR-15 rifle-length gas tube is a stainless steel gas tube for AR-15 rifles. Designed for direct impingement AR platform rifles using a rifle-length gas system. Rifle-length stainless steel construction provides corrosion resistance and durability. Size is 15 inches in length and weighs approximately 1 ounce. Compatible with AR-15 rifles that utilize a rifle-length gas system.