Ductile Napier 2nd Ring 4.350 Bore 1/16

The Ductile Napier 2nd Ring 4.350 bore 1/16 thickness piston ring from Total Seal is a precision engine component engineered for demanding applications in racing, law enforcement, and military small arms maintenance. This second ring assembly plays a critical role in cylinder compression and blowby control, directly impacting bolt carrier reliability and cycling consistency in high-round-count operational environments. Whether you're rebuilding a duty firearm or optimizing performance in competitive shooting platforms, this ring delivers the dimensional accuracy and material integrity required for mission-critical reliability.

Total Seal's ductile iron construction provides superior conformability compared to cast iron alternatives, allowing the ring to seat faster and maintain consistent gas sealing across the bore surface even under extreme chamber pressures and rapid-fire sequences. The 1/16-inch thickness specification balances minimal friction with maximum structural integrity, reducing heat generation during sustained fire while preventing premature wear on cylinder walls. The 4.350-inch bore diameter targets precision rifle platforms commonly encountered in specialized operations, ensuring exact fitment and predictable performance across cycling conditions.

This component is essential for armorsmiths, precision rifle builders, and tactical operators managing long-service-life firearms in field conditions. Proper installation requires careful alignment and inspection to verify bore dimensions before fitting—any deviation compromises gas sealing and reliability. Total Seal rings are OEM-standard quality and compatible with most modern sporting rifles, precision competition builds, and military platform rebuilds where original manufacturer specifications must be maintained for warranty and operational compliance.