While traditional AR cam pins have a square head, the 307 Roller Cam Pin Assembly from POF USA has a rounded head to reduce friction and drag. This is one of the many improvements POF USA has made to reduce friction inside your AR upper, preventing the component from dragging across the inside of your upper receiver and damaging the metal. It is made from aluminum with a stainless finish, and it fits any gas piston carrier for rifles chambered in .223 or 5.56x45mm NATO. Specifications for POF USA AR-15 Roller Cam Pin Assembly: Manufacturer: POF USA Gun Model: AR-15 Color: Stainless Steel Fabric/Material: Steel Quantity: 1 Finish: Stainless Included Accessories: Standard Features of POF USA AR-15 Roller Cam Pin Assembly: Aluminum Roller Cam Pin; Rounded Head for Reduced Friction Package Contents: POF USA AR-15 Roller Cam Pin Assembly The POF 00307 ROLLER CAM PIN ASSEMBLY 223 is a quality addition to the POF USA lineup. For more great deals on Rifle Parts by POF USA, please browse our POF USA Gun Parts page.