1. Precision Design: The screw is likely manufactured with precision to meet the high standards associated with Feinwerkbau air rifles.

2. Material: The screw is likely made from durable and corrosion-resistant materials to ensure longevity and reliability in various shooting conditions.

3. Compatibility: The FWB Firing Pin Spring Screw is designed to be a compatible spare part for specific models of Feinwerkbau air rifles.

4. Firing Pin Spring: Given the name, the screw may be directly associated with securing or adjusting the firing pin spring, which plays a role in the firing mechanism's proper functioning.

FWB Fring pin spring screw 
FWB 800X,
FWB 700 Evolution Top,
FWB 700 ALU Stock,
FWB 700 UNIVERSAL
Firing pin spring screw