Air Arms filling valve assembly for the following air rifles:
– s300 (if converted to newest style)
– s310 (if converted to newest style)
– s400 (if fitted with newest style)
– s410 (if fitted with newest style)
– s410 TDR (if fitted with newest style)
– s500 (if fitted with newest style)
– s510 & s510 TDR & Ultimate Sporter Models

The newest style fill system is shown here