Restore the legendary, match-grade consistency of your Olympic 10-metre match rifle with our premium FWB 300 Feinwerkbau 300/S Piston Seal. Precision-engineered to original specifications, this upgrade features a custom Molybdenum Disulfide (MoS2) Impregnated Polyurethane matrix. The self-lubricating material composition guarantees ultra-low friction, eliminates velocity variations, and forms a reliable, airtight fit. Designed as a traditional mushroom-shaped clip-on piston head, it drops seamlessly into your classic Feinwerkbau 300 and 300S actions.