OX Mainsprings for Airrifles and Pistols bench-rest-bag Inside the S510 its balanced

Inside the S510 its balanced firing valve metres the power

the new magazines are freewheeling and employ an integral pellet stop

Please note

- Tube Size: To fit 30mm diameter body tube scopes

- Max Windage Adj – 73 MOA

OX Mainsprings for Airrifles and Pistols bench-rest-bag Inside the S510 its balancedDescription The World's NO. 1 square spring. The perfect replacement or upgrade for standard mainsprings. Warning replacing your air rifles mainspring may increase its power making it illegal. Redbeck Shooting Supplies would recommend that you seek manufacturers advice or a professional gunsmith before attempting to alter your rifle, and that you always check your rifles power using an accurate chronograph to ensure you stay within the law. NO1 FITS