Sprinco USA AR-15 Bolt Gas Rings (9-Pack) are precision-made from cryogenically treated stainless steel for enhanced strength and longevity. Designed for standard AR-15 platforms, these Mil-Spec gas rings ensure optimal seal and function of your bolt assembly. Ideal for maintenance or quick repairs, this convenient 9-pack is perfect for your bench stock or field kit, keeping your rifle running reliably when it matters most.