Genuine FX OEM Part 20858, replaces the Delrin (plastic) 19696 16mm regulator piston

Made of brass with a small Delrin seal on top. Comes with 4x1.5 NBR70 O-ring installed

Fits any FX rifle taking a 16mm regulator piston 

Examples: 

• FX Impact Mk2 / M3 / M4
• FX Crown Mk1 / Mk2
• FX Wildcat Mk3 & MK3 BT
• FX Wildcat Mk2 (AMP regulated models [external adj.])
• FX Dreamline 
• FX Maverick
  
• FX Panthera Mk1 / Mk2
• FX Dynamic Mk1 / Mk2
• FX King
• FX DRS(all variants)

All rifles after approximately mid-2023 should have this piston installed from factory.