Kaw Valley Precision AR-15 One Piece Gas Ring for 5.56/.223 Caliber Stainless Steel Small. The simple one piece gas ring provides the shooter with a 100percent guarantee that the BCG will never have misaligned gas rings. The one piece ring is easy to install and is constructed of Stainless Steel which provides a long worry free duty life in any AR-15. Specifications for Kaw Valley Precision AR-15 One Piece Gas Ring: Manufacturer: Kaw Valley Precision Color: Stainless Steel Fabric/Material: Stainless Steel Package Contents: Kaw Valley Precision AR-15 One Piece Gas Ring Kaw Valley Precision KVP-GASRING: AR-15 One Piece Gas Ring for 5.56/.223 Caliber Stainless Steel Small