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 represents precision engine architecture for firearms that demand reliability under sustained fire. This compression ring is engineered for shooters and gunsmiths who require OEM-quality or superior replacement components in custom rifle builds, high-round-count training platforms, and duty firearms. Whether you're rebuilding a precision rifle platform or servicing a firearm experiencing seal degradation, this ring delivers the controlled gas containment and bore surface protection that separates reliable firearms from problematic ones.

Total Seal's ductile construction provides superior durability compared to conventional cast rings, resisting fracture during rapid thermal cycling and high-pressure events typical of centerfire rifle ammunition. The 1/16-inch thickness and 4.350-inch bore dimension indicate compatibility with large-bore rifle platforms; the Napier design geometry optimizes radial pressure distribution for consistent bore sealing while minimizing drag on the bolt carrier or piston rod. Ductile material composition maintains dimensional stability across temperature extremes—critical for suppressors-equipped or high-velocity platforms where sustained gas exposure and thermal stress are unavoidable.

Law enforcement armorers, competitive shooters, and gunsmiths benefit most from Total Seal's precision standards; this second ring complements primary compression rings in multi-ring piston systems, particularly in AR-10 platforms, custom bolt-action rifles, and piston-driven modern sporting rifles experiencing high-round-count maintenance cycles. Installation requires disassembly of the bolt carrier or piston assembly; consult manufacturer specifications to verify bore and groove dimensions match your specific platform before installation. This ring is a core component in maintaining sub-minute-of-angle accuracy and reliable cycling in demanding duty and competition environments.